Roberto Clemente once said: "Anytime you have an opportunity to make things better and you don't, then you are wasting your time on Earth."

VOA: special.2010.04.11

You'd be wasting your time, wasting your money here, so don't do this if you find at the end of this you've got sixteen, seventeen, eighteen of these correct.

你是在浪费你的精力和金钱,所以如果发现你在小测验最后,已经能够答对百分之七八十,那就不要选这门课了

耶鲁公开课 - 聆听音乐课程节选