If you've picked up any textbook written in the last hundred years or so, chances are they published it.
只要你拿起过去一百年来任何一本教科书,很有可能就是他们出版的。
So just before the test, I had written several notes from the textbook on my desk in pencil.
所以就在考试前,我在书桌上用铅笔从课本上抄了几条笔记。
All four of them have taken time away from academia to work in policy jobs in Washington. Three out of four have written textbooks, and two of them have written more than one textbook.
他们四人都曾在华府从事过一些政策性工作,三人编写过教材用书,其中两人编写的书目还不止一本。
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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