对它先用酸处理再进行分析。

It is treated with acid before being analysed.

《牛津词典》

一些空间将首先用于贮藏。

Some of the space will at first be used for storage.

《柯林斯英汉双解大词典》

在非洲南部，有些人先用棍子刷牙。

In the south of Africa, some people brush their teeth with sticks first.

youdao

Well, let me come up with a sample set of elements here and let me go ahead and just get some fresh white board space.

下面我用一个元素的样本集来说明,我先找一些可用的白板空间。

哈佛公开课 - 计算机科学课程节选

let's try and analyze this game using the tools we've learned so far.

我们先用已经学过的知识,来分析这个博弈

耶鲁公开课 - 博弈论课程节选

It involves putting a needle, a fairly large needle into usually one of the pelvic bones and collecting marrow from which is tissue that's deep inside those bones.

先要用针头,相当大的针头刺进你的盆骨,然后进行收集,这些在骨头深处的骨髓

耶鲁公开课 - 生物医学工程探索课程节选