我想我们可以先问问观众哪种汽车引擎被最早设计为使用化石或生物燃料。

I thought we could start by asking our audience what car engines were first designed to run on-fossil fuels or biofuels.

youdao

youdao

当你必须用英语说某事时，先问问自己“我知道什么英语单词和短语在这种情况下可以用上？”

When you have to say something in English, think first and ask yourself" What words and phrases do I know in English that I can use in this situation?"

youdao

Before I do that, let me just check.

在讲它之前,我先问问你们

耶鲁公开课 - 博弈论课程节选

c We know it's very specific for light because in this equation is c, the speed of light. So any time you go to use this equation, if you're trying to use it for an electron, just ask yourself first, does an electron travel at the speed of light?

我们知道它只对光适用是因为在这个方程里有,光速，所以下次你们用这个方程前，如果你们要把它用到一个电子上，先问问你自己，电子的运动速度是光速吗？

麻省理工公开课 - 化学原理课程节选