如果你一定要呆在阳光下的话，就用你能买到的最有效的防晒霜。

If you must be in the sunlight, use the strongest sunscreen you can get.

《柯林斯英汉双解大词典》

如果你要创造奇迹治好他，那就用你的杖打在他的肩上，其余的就交给上帝吧。

An' thou would'st do a healing miracle, lay thy staff over his shoulders and trust Providence for the rest.

youdao

我没有兜子——就用你的帽子吧。

I haven't got one - use you hat.

youdao

Our friend Schr?dinger told us that if you solve for the wave function, this is what the probability densities look like.

我们的朋友薛定谔告诉我们,如果你用波函数来解决，你就会知道这些概率密度看上去的样子。

麻省理工公开课 - 固态化学导论课程节选

because it will give you an opportunity to say "I want to be sure that this is done, has been done"

因为用这个句型，你就能表达“我想确认这事会做到的，或者已经做到了。”

Make sure 课堂 - SpeakingMax英语口语达人

So if it's not a cell that's going through division you can't use a retrovirus to express the protein.

如果细胞不在分裂阶段,你就不能用逆转录病毒来表达某个蛋白

耶鲁公开课 - 生物医学工程探索课程节选