The answer is yes. However, you first must take the steps necessary to protect yourself and your family from the dangers of the sun.

VOA: special.2010.07.06

In other words, to make people obey you, you must first make them believe you.

换句话说即要让人们服从你，必需要先让他们相信你。

耶鲁公开课 - 政治哲学导论课程节选

Best way to lose weight? Well, first of all, you must be active.

减肥最好的办法？嗯，首先，你必须积极主动。

要拥有好身材 - SpeakingMax英语口语达人

Of course, before doing so, he says, "you must call him first a tyrant."

当然，在叛乱或是弑君之前，你得确定你要诛杀的是一位暴君“

耶鲁公开课 - 政治哲学导论课程节选

This was my first glance at plum pudding, and I guess you can see that this must be that positive part -- most of the plums are within that, and you can see all these little raisins or plums in here, that would be that negative charge.

我想你们可以，看到着一定是正电部分,大部分的李子,都在这里面，你们也可以看到,这些小的葡萄干或李子，这就是负电荷。

麻省理工公开课 - 化学原理课程节选