At my old age, I can spend my time" "When I was a young man, that's all I did.

活到这把年纪，我可以把时间花在．．．,当我还是小伙子时，脑中总是性。

耶鲁公开课 - 政治哲学导论课程节选

Well, I started playing baseball when I was really young, about...I think I was seven years old,

我很小的时候就开始打棒球了，大概是……，我想那时候我大概七岁吧，

会打棒球吗？ - SpeakingMax英语口语达人

At this time, I also reconnected with my first boss when I was 15 years old.

这个时候，我也再次联系到了我15岁,时第一个老板。

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When I was a young man," he said and this is written as he is very old.

当我还年轻时“，他说到,因为这信是在他年迈时所写。

耶鲁公开课 - 政治哲学导论课程节选

Convention, OK, this negative sign is just a pure convention. You just got to use it all the time. If you use an old textbook, written when I was taking thermodynamics, they have the opposite convention, and it's very confusing. But now we've all agreed on this convention, and work is going to be with the negative sign here.

系统对外界做功的符号为负,这就是我们,在本课中的规定，纯粹出于统一符号的需要，有些教科书中，可能会使用相反的符号规定,注意不要混淆了，这门课上,我们将一直使用。

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