你需要退回去，把训练拆分得更小一些。

You need to back up the work and split the exercise into smaller pieces.

youdao

若需要退回收据原件(仅限家属)向第三方索赔，请同时提供退回单据的复印件。

If original receipt (s) are needed to be returned (for dependents ONLY), please provide the copy of bill and the original one.

youdao

当需要使用某个变量时，就退回php模式，并发出一条echo语句将该变量的值直接写入网页正文中。

Whenever we need to use one of the variables, you pop back into PHP mode and issue an echo statement to write the variable's value directly into the Web page text.

youdao

So, what we say here is we need to take a step back here and come up with an approximation that's going to allow us to think about using the Schrodinger equation when we're not just talking about hydrogen or one electron, but when we have these multi-electron atoms.

所有我们这里要说的是,我们需要退回一步,做一个近似,那样可以使我们用,薛定谔方程来考虑,让我们不是仅仅在讨论氢原子或者,一个电子的时候，而是多个电子的原子。

麻省理工公开课 - 化学原理课程节选