他把地址记下以防忘记。

He takes out a notbook from his pocket.

youdao

在考试中我们会给出这个值，以防你们到时候忘记。

We will give this value in the exam in case you forget it then.

youdao

比如，默认情况下，好友列表的内容以备份形式存储在服务器中，以防您忘记好友的身份。

For example, by default the contents of your buddy list are stored on the server as a backup, in case you forget the identity of your buddies.

youdao

But again, that we will supply for you on the exam just in case you forget it at that moment.

但在考试中我们会给出这个值,以防你当时忘记了。

麻省理工公开课 - 化学原理课程节选

Now hopefully you're keeping a sheet of paper with you and you're writing down what you eat so you don't forget everything, and then you sit down at your computer at the end of the day and you log it all in.

希望你们可以随时带张纸,以便随时记下,吃的东西以防忘记,然后坐在电脑前,在一天结束时输入电脑

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选