theirKK [ˋðɛr] /ˈðɛɹ/限定詞1他們的、她們的、牠們的The students left their bags in the classroom.學生把書包留在教室裡。2他的、她的用於性別不明或不特指的單數Every applicant must sign their form before leaving.每位申請人離開前都必須在表格上簽名。3其指事物或組織The company doubled their profits in three years.這家公司三年內獲利翻了一倍。