Sometimes you may forget what the date is on a certain day.

有时候，在一些特定的日子里，你可能会忘记那天是几月几号？

youdao

In this way, you can easy monitor your progress measuring what you did a certain day and what had to do.

这样可以轻松的掌控进度，某一天需要做什么。

youdao

In her message Miss Mengqian told potential suitors to come to her room on a certain day at a certain time and shout out her name.

在这个女生的愿望中，她要求潜在的求婚者在特定的时间到她的寝室并喊出她的名字，但是当这一时刻来临的时候有成千追求者聚集。然而只有少数人有勇气喊出她的名字。

youdao

"Whereas the oil industry may find it business as usual to have a certain number of spills, it is really not acceptable, especially in this day and age.

VOA: special.2011.07.08

But wouldn't it be nice to just have a certain period of time every day when you didn't have to even have it be ? so much as a remote possibility?

但要是每天能有一段特定的时间,死亡对你来说,甚至连一个遥远的可能性都不是,那岂不是很好？

耶鲁公开课 - 死亡课程节选

"Our health and wellness committee provided us with pedometers and there was a contest to see how many people could log ten thousand or more steps each day over a certain period.

VOA: special.2011.02.28

Such performance-based exams have a big advantage over multiple choice: They go beyond whether students can regurgitate a set of facts on a certain day to assess their know-how.

FORBES: Instant feedback in the classroom

All of these facts together may make it seem more likely that kids are getting a fever on a certain day of the week even though it may just be a coincidence.

CNN: Why do kids always get fevers on Sunday nights?

In the swap, Enron agreed to pay the billing service for heating degree days above a certain amount, and get paid for every heating degree day below a certain amount.

FORBES: Betting against God