But they spent a lot of time, energy, and money on being sure that they would have a supply of water to hold them for a long siege.

他们花费了大量的时间,精力,和金钱来确保,在长期的围城中他们可以获得足够的水源

耶鲁公开课 - 古希腊历史简介课程节选

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