on file

基本解释

You will also add the ability to update any employee information on file.
您還要增加軟件的功能，使其能夠在文件中更新所有雇員的信息。
You can see the sorts of reports available: statistics on the code authors, a view into the Commit Log, a Lines of Code section, and some statistics on file and directory sizes.
可以看到可用報告的分類：關於代碼作者的一些統計數據、查看提交日志、代碼段的行，以及關於文件和目錄大小的一些統計。
PODS stores medical record image files on file servers; it uses an IBM DB2 database to store corresponding metadata and a network attached storage array for the image files, including PDFs and text.
PODS 在文件服務器上存儲毉療記錄圖像文件；它使用 IBM DB2 數據庫存儲相應的元數據，用網絡附屬存儲陣列存儲圖像文件，包括 PDF 和文本。

Some protestors carry signs comparing the Obama administration with Nazi Germany, and fringe elements still question whether the president is really a U.S.citizen, despite the fact that he has an official birth cirtificate on file with the state of Hawaii and birth announcements were printed shortly after he was born.
He has all the information he knows that has been reported on the various elements on file cards He even carried them around in his pocket and he would look at them from time to time and try to devise a scheme.
他將所有他知道的,已經研究出來的元素的信息放到文件卡片上,他將它們隨身攜帶在口袋裡,這樣他就可以時不時地看它們了,竝且試圖設計出一個圖表。
麻省理工公開課 - 固態化學導論課程節選
And, it's also, I think they keep in on file.
還有，我想這個還會記錄在档案裡。
關於課程評價制度 - SpeakingMax英語口語達人

Or from the photos on file at the casinos where Yvette Mulvey had worked.
NEWYORKER: I.D.