If you're a doctor and you've got a patient who's running away from you at the speed of light, you'll know what to do.

如果你是个医生,你的一个病人以光速逃跑了,你就知道该怎么办了

耶鲁公开课 - 基础物理课程节选

But it also indicates one of the dangers that we have, is that you've got to chip away at this problem.

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Or it means maybe you can't start up that business right away that you've got this great idea for.

WHITEHOUSE: President Obama Speaks on Student Loan Interest Rates in Colorado | The White House

You've got to put them away early.

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