diff --git a/message/extract/extract.go b/message/extract/extract.go
index 190ba79..ce38e69 100644
--- a/message/extract/extract.go
+++ b/message/extract/extract.go
@@ -41,7 +41,7 @@ type extractor struct {
 // Extract 提取本地化内容
 //
 // o 给定的参数错误，可能会触发 panic，比如 o 为空、o.Funcs 格式错误等。
-func Extract(ctx context.Context, o *Options) (*message.Language, error) {
+func Extract(ctx context.Context, o *Options) (*message.File, error) {
 	if o == nil {
 		panic("参数 o 不能为空")
 	}
@@ -62,7 +62,7 @@ func Extract(ctx context.Context, o *Options) (*message.Language, error) {
 
 	slices.SortStableFunc(ex.msg, func(a, b message.Message) int { return cmp.Compare(a.Key, b.Key) })
 
-	return &message.Language{ID: o.Language, Messages: ex.msg}, nil
+	return &message.File{ID: o.Language, Messages: ex.msg}, nil
 }
 
 func (ex *extractor) inspectDirs(ctx context.Context, dirs []string) error {
diff --git a/message/message.go b/message/message.go
index ac25120..fabc6ea 100644
--- a/message/message.go
+++ b/message/message.go
@@ -18,8 +18,8 @@ import (
 )
 
 type (
-	// Language 某一语言的本地化内容
-	Language struct {
+	// File 单个本地化语言组成的文件
+	File struct {
 		XMLName  struct{}     `xml:"language" json:"-" yaml:"-"`
 		ID       language.Tag `xml:"id,attr" json:"id" yaml:"id"` // 如果用字符串，还需要处理大小写以及不同值表示同一个 language.Tag 对象的问题
 		Messages []Message    `xml:"message" json:"messages" yaml:"messages"`
@@ -64,7 +64,7 @@ type (
 //
 //	-如果 l2 的 [Message.Key] 存在于 l，则覆盖 l 的项；
 //	-如果 l2 的 [Message.Key] 不存在于 l，则写入 l；
-func (l *Language) Join(l2 *Language) {
+func (l *File) Join(l2 *File) {
 	for index, m2 := range l2.Messages {
 		elem, found := sliceutil.At(l.Messages, func(m1 Message, _ int) bool { return m1.Key == m2.Key })
 		if !found {
@@ -84,16 +84,16 @@ func (l *Language) Join(l2 *Language) {
 //
 // 最终内容是 dest 为准。
 // log 所有删除的记录都将通过此输出；
-func (l *Language) MergeTo(log LogFunc, dest []*Language) {
+func (f *File) MergeTo(log LogFunc, dest []*File) {
 	for _, d := range dest {
-		l.mergeTo(log, d)
+		f.mergeTo(log, d)
 	}
 }
 
-func (l *Language) mergeTo(log LogFunc, dest *Language) {
+func (f *File) mergeTo(log LogFunc, dest *File) {
 	// 删除只存在于 dest 而不存在于 l 的内容
 	dest.Messages = sliceutil.Delete(dest.Messages, func(dm Message, _ int) bool {
-		exist := slices.IndexFunc(l.Messages, func(sm Message) bool { return sm.Key == dm.Key }) >= 0
+		exist := slices.IndexFunc(f.Messages, func(sm Message) bool { return sm.Key == dm.Key }) >= 0
 		if !exist {
 			log(localeutil.Phrase("the key %s of %s not found, will be deleted", strconv.Quote(dm.Key), dest.ID))
 		}
@@ -101,7 +101,7 @@ func (l *Language) mergeTo(log LogFunc, dest *Language) {
 	})
 
 	// 将 l 独有的项写入 dest
-	for _, sm := range l.Messages {
+	for _, sm := range f.Messages {
 		if slices.IndexFunc(dest.Messages, func(dm Message) bool { return dm.Key == sm.Key }) < 0 {
 			dest.Messages = append(dest.Messages, sm)
 		}
@@ -109,8 +109,8 @@ func (l *Language) mergeTo(log LogFunc, dest *Language) {
 }
 
 // Catalog 将本地化信息附加在 [catalog.Catalog] 上
-func (l *Language) Catalog(b *catalog.Builder) (err error) {
-	for _, msg := range l.Messages {
+func (f *File) Catalog(b *catalog.Builder) (err error) {
+	for _, msg := range f.Messages {
 		switch {
 		case msg.Message.Vars != nil:
 			vars := msg.Message.Vars
@@ -120,12 +120,12 @@ func (l *Language) Catalog(b *catalog.Builder) (err error) {
 				msgs = append(msgs, mm)
 			}
 			msgs = append(msgs, catalog.String(msg.Message.Msg))
-			err = b.Set(l.ID, msg.Key, msgs...)
+			err = b.Set(f.ID, msg.Key, msgs...)
 		case msg.Message.Select != nil:
 			s := msg.Message.Select
-			err = b.Set(l.ID, msg.Key, plural.Selectf(s.Arg, s.Format, ex(s.Cases)...))
+			err = b.Set(f.ID, msg.Key, plural.Selectf(s.Arg, s.Format, ex(s.Cases)...))
 		case msg.Message.Msg != "":
-			err = b.SetString(l.ID, msg.Key, msg.Message.Msg)
+			err = b.SetString(f.ID, msg.Key, msg.Message.Msg)
 		}
 
 		if err != nil {
diff --git a/message/message_test.go b/message/message_test.go
index cac8c70..dde8c55 100644
--- a/message/message_test.go
+++ b/message/message_test.go
@@ -18,11 +18,11 @@ import (
 func TestLanguage_Join(t *testing.T) {
 	a := assert.New(t, false)
 
-	src := &Language{
+	src := &File{
 		ID:       language.SimplifiedChinese,
 		Messages: []Message{{Key: "src"}, {Key: "g", Message: Text{Msg: "src"}}},
 	}
-	l := &Language{
+	l := &File{
 		ID:       language.SimplifiedChinese,
 		Messages: []Message{{Key: "l"}, {Key: "g", Message: Text{Msg: "l"}}},
 	}
@@ -34,28 +34,28 @@ func TestLanguage_MergeTo(t *testing.T) {
 	a := assert.New(t, false)
 	log := func(s localeutil.Stringer) {}
 
-	dest := &Language{
+	dest := &File{
 		ID:       language.SimplifiedChinese,
 		Messages: []Message{{Key: "dest"}},
 	}
-	l := &Language{
+	l := &File{
 		ID:       language.Afrikaans,
 		Messages: []Message{{Key: "l"}},
 	}
-	l.MergeTo(log, []*Language{dest})
+	l.MergeTo(log, []*File{dest})
 	a.Equal(dest.ID, language.SimplifiedChinese).
 		Length(dest.Messages, 1).Equal(dest.Messages[0].Key, "l").
 		Length(l.Messages, 1).Equal(l.Messages[0].Key, "l")
 
-	dest = &Language{
+	dest = &File{
 		ID:       language.SimplifiedChinese,
 		Messages: []Message{{Key: "dest"}, {Key: "g"}},
 	}
-	l = &Language{
+	l = &File{
 		ID:       language.SimplifiedChinese,
 		Messages: []Message{{Key: "l"}, {Key: "g"}},
 	}
-	l.MergeTo(log, []*Language{dest})
+	l.MergeTo(log, []*File{dest})
 	a.Length(dest.Messages, 2).
 		Length(l.Messages, 2).Equal(l.Messages[0].Key, "l").Equal(l.Messages[1].Key, "g")
 }
@@ -64,7 +64,7 @@ func TestLanguage_Catalog(t *testing.T) {
 	a := assert.New(t, false)
 
 	b := catalog.NewBuilder()
-	l := &Language{
+	l := &File{
 		ID: language.SimplifiedChinese,
 		Messages: []Message{
 			{Key: "k1", Message: Text{Msg: "msg1"}},
diff --git a/message/serialize/marshal.go b/message/serialize/marshal.go
index 2f0509c..dee9c80 100644
--- a/message/serialize/marshal.go
+++ b/message/serialize/marshal.go
@@ -17,7 +17,7 @@ import (
 type MarshalFunc = func(any) ([]byte, error)
 
 // Marshal 将 l 转换为 []byte
-func Marshal(l *message.Language, f MarshalFunc) ([]byte, error) {
+func Marshal(l *message.File, f MarshalFunc) ([]byte, error) {
 	// 输出前排序，保证相同内容输出的内容是一样的。
 	slices.SortStableFunc(l.Messages, func(a, b message.Message) int { return cmp.Compare(a.Key, b.Key) })
 	return f(l)
@@ -26,7 +26,7 @@ func Marshal(l *message.Language, f MarshalFunc) ([]byte, error) {
 // SaveFile 将 l 编码为文本并存入 path
 //
 // 如果文件已经存在会被覆盖。
-func SaveFile(l *message.Language, path string, f MarshalFunc, mode fs.FileMode) error {
+func SaveFile(l *message.File, path string, f MarshalFunc, mode fs.FileMode) error {
 	data, err := Marshal(l, f)
 	if err == nil {
 		err = os.WriteFile(path, data, mode)
@@ -35,7 +35,7 @@ func SaveFile(l *message.Language, path string, f MarshalFunc, mode fs.FileMode)
 }
 
 // SaveFiles 将 langs 按语言 ID 分类保存
-func SaveFiles(langs []*message.Language, dir, ext string, f MarshalFunc, mode fs.FileMode) error {
+func SaveFiles(langs []*message.File, dir, ext string, f MarshalFunc, mode fs.FileMode) error {
 	if ext[0] != '.' {
 		ext = "." + ext
 	}
diff --git a/message/serialize/unmarshal.go b/message/serialize/unmarshal.go
index 8ec9bf7..d9323fe 100644
--- a/message/serialize/unmarshal.go
+++ b/message/serialize/unmarshal.go
@@ -19,23 +19,23 @@ type UnmarshalFunc = func([]byte, any) error
 type Search = func(string) UnmarshalFunc
 
 // Unmarshal 加载内容
-func Unmarshal(data []byte, u UnmarshalFunc) (*message.Language, error) {
-	l := &message.Language{}
+func Unmarshal(data []byte, u UnmarshalFunc) (*message.File, error) {
+	l := &message.File{}
 	if err := u(data, l); err != nil {
 		return nil, err
 	}
 	return l, nil
 }
 
-func LoadFile(path string, u UnmarshalFunc) (*message.Language, error) {
+func LoadFile(path string, u UnmarshalFunc) (*message.File, error) {
 	return unmarshalFS(func() ([]byte, error) { return os.ReadFile(path) }, u)
 }
 
-func LoadFS(fsys fs.FS, name string, u UnmarshalFunc) (*message.Language, error) {
+func LoadFS(fsys fs.FS, name string, u UnmarshalFunc) (*message.File, error) {
 	return unmarshalFS(func() ([]byte, error) { return fs.ReadFile(fsys, name) }, u)
 }
 
-func unmarshalFS(f func() ([]byte, error), u UnmarshalFunc) (*message.Language, error) {
+func unmarshalFS(f func() ([]byte, error), u UnmarshalFunc) (*message.File, error) {
 	data, err := f()
 	if err != nil {
 		return nil, err
@@ -46,13 +46,13 @@ func unmarshalFS(f func() ([]byte, error), u UnmarshalFunc) (*message.Language,
 // LoadGlob 批量加载文件
 //
 // 相同 Language.ID 的项会合并。
-func LoadGlob(s Search, glob string) ([]*message.Language, error) {
+func LoadGlob(s Search, glob string) ([]*message.File, error) {
 	matches, err := filepath.Glob(glob)
 	if err != nil {
 		return nil, err
 	}
 
-	langs := make([]*message.Language, 0, len(matches))
+	langs := make([]*message.File, 0, len(matches))
 	for _, match := range matches {
 		u := s(match)
 		if u == nil {
@@ -71,8 +71,8 @@ func LoadGlob(s Search, glob string) ([]*message.Language, error) {
 // LoadFSGlob 批量加载文件
 //
 // 相同 Language.ID 的项会合并。
-func LoadFSGlob(s Search, glob string, fsys ...fs.FS) ([]*message.Language, error) {
-	langs := make([]*message.Language, 0, 10)
+func LoadFSGlob(s Search, glob string, fsys ...fs.FS) ([]*message.File, error) {
+	langs := make([]*message.File, 0, 10)
 	for _, f := range fsys {
 		matches, err := fs.Glob(f, glob)
 		if err != nil {
diff --git a/message/serialize/unmarshal_test.go b/message/serialize/unmarshal_test.go
index 3dc6f34..ed647b1 100644
--- a/message/serialize/unmarshal_test.go
+++ b/message/serialize/unmarshal_test.go
@@ -39,5 +39,5 @@ func TestSaveFile(t *testing.T) {
 	l2, err := LoadFS(os.DirFS("./testdata"), "cmn-hant.xml", xml.Unmarshal)
 	a.NotError(err).NotNil(l2)
 
-	a.NotError(SaveFiles([]*message.Language{l1, l2}, "./testdata/", ".out", json.Marshal, os.ModePerm))
+	a.NotError(SaveFiles([]*message.File{l1, l2}, "./testdata/", ".out", json.Marshal, os.ModePerm))
 }