电池使用前必须充电。

Before use, the battery must be charged.

《牛津词典》

youdao

使用前请仔细阅读说明。

Please read the directions before using.

youdao

Well, a while back I said that we'll use it at least for a few weeks this moniker string.

好的，前阵子我说过，我们将至少,要使用这个绰号几周。

哈佛公开课 - 计算机科学课程节选

And the prefactor is 96.3 3 when you want to get a result in kilojoules per mole.

当使用千焦每摩表示键能3,时前因子为96。

麻省理工公开课 - 固态化学导论课程节选