If the question of time is not explicitly brought up, then you should know that you have to use this formula.

如果时间的问题并没有明确提出,那你应该知道,必须要用这个式子

耶鲁公开课 - 基础物理课程节选

If you haven't looked at the homework problems, you might have difficulty with the homework quiz.

但如果你没有看过作业的问题，这个测试则将会很难。

麻省理工公开课 - 固态化学导论课程节选

All right. So, we'll come around and get ping-pong balls to the rest of you.

还有什么问题吗？如果你们,还没有乒乓球的话请举手，还有问题吗？

麻省理工公开课 - 化学原理课程节选

Here's a twist, and if you found people who were less wonderful than you all, and asked them, you'd get a lot of people saying the curving thing.

这是错误的,如果你去找一些没有你们优秀的人,问他们这个问题,很多人会回答你沿着曲线飞出

耶鲁公开课 - 心理学导论课程节选