My biology teacher, Mr. White, came to the classroom five minutes before the class began.

我的生物老师怀特先生在上课前五分钟来到了教室。

youdao

Did you preview before the class?

你在上课前有预习的吗？

youdao

Check the markers before the class.

上课前检查一下麦克笔。

youdao

He spoke before signing an order to create the Task Force on Middle-Class Working Families.

VOA: special.2009.01.31

Some of the questions that I have already received from you before the class started.

有几个问题课前就有人问我了。

哈佛公开课 - 幸福课课程节选

And unsurprisingly-- since I announced this was going to be the result before the class had barely gotten started-- I don't think any of these arguments work.

我在课程还没正式开始的时候,就已经说过了,我认为这些论证都站不住脚

耶鲁公开课 - 死亡课程节选

She was too weak from the treatment and felt too self-conscious appearing before the class.

BBC: NEWS | Health | 'I had breast cancer aged 24'

For example, it's important that you wear loose cotton clothing, and that you refrain from eating for an hour or two before the class.

CNN: Yoga: Fitness from the inside out

But Apple intervened before the class began and offered to let the students upgrade to iPad 2s, according to Eric Greenberg, who coordinates the course.

FORBES: Apple Lets Some Students Exchange iPads For iPad 2s