關於「Signature line」標籤，搜尋引擎有相關的訊息討論：

圖片全部顯示Add a signature line - Microsoft SupportInsert a graphic of your signature, save it as AutoText, or add a blank signature line to an online or printed document.缺少字詞： gl= twAdd or remove a digital signature in Office files - Microsoft SupportLearn about digital signatures