on file

基本解释

You will also add the ability to update any employee information on file.
您还要增加软件的功能，使其能够在文件中更新所有雇员的信息。
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.
可以看到可用报告的分类：关于代码作者的一些统计数据、查看提交日志、代码段的行，以及关于文件和目录大小的一些统计。
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 在文件服务器上存储医疗记录图像文件；它使用 IBM DB2 数据库存储相应的元数据，用网络附属存储阵列存储图像文件，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.
他将所有他知道的,已经研究出来的元素的信息放到文件卡片上,他将它们随身携带在口袋里,这样他就可以时不时地看它们了,并且试图设计出一个图表。
麻省理工公开课 - 固态化学导论课程节选
And, it's also, I think they keep in on file.
还有，我想这个还会记录在档案里。
关于课程评价制度 - SpeakingMax英语口语达人

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