或许会有特殊的例子,摩尔数在前后是一样的。

So it may be that there's a special case where the number of moles before and after are the same.

youdao

在每种情况中，当密码处在前后不一致的短暂时期的时候，都存在一定的故障风险。

In either case, there is a risk of an outage if a password happens to be used during the brief period of inconsistency.

youdao

假如你的头发在前后两次洗头中间这段时间又脏又油的话，养成一个更勤洗头的习惯。

If your hair is dirty and greasy between times when you wash it, make it a habit to wash it more often.

youdao

In between those two parts I will ask that anyone who is shopping the class and would like to leave at that time do so then.

在前后两部分之间,请来试听并且想离开的同学在那时候离开,如果你能尽量等到那个时候。

耶鲁公开课 - 1945年后的美国小说课程节选

So you can imagine a bead with a wire going through it and the bead can only slide back and forth.

你可以想象一个穿在绳子上的珠子,小珠只能前后滑动

耶鲁公开课 - 基础物理课程节选

He said I had it, so he headed off to a villa in the mountains, Christmastime 1925.

他说我得出结果了，所以他隐居到,山上的住宅，在1925年得圣诞前后。

麻省理工公开课 - 固态化学导论课程节选