You can go ahead and use that equation, or you could figure it out every time, because if you know the total number of nodes, and you know the angular node number, then you know how many nodes you're going to have left.

你们可以直接用这个方程，或者每次都自己算出来，因为如果你们知道了总的节点数，又知道角向节点数，就知道剩下的节点数是多少。

麻省理工公开课 - 化学原理课程节选

instead of just like being able to get the numbers right.

而不只是把数算对了。

留学生的适应期 - SpeakingMax英语口语达人

He went 70. I tingled all over. I counted minutes and subtracted miles.

他其实有70了，我太激动了，算着时间和英里数。

耶鲁公开课 - 1945年后的美国小说课程节选

If you have a bond with an interest rate of 4.375% -that's not an easy one to divide by two but you would get half of that every six months until maturity.

如果你持有一种利率为4.375%的债券,这个数除以2有点难算,而在债券到期前,每半年你能得到4.375%一半的券息

耶鲁公开课 - 金融市场课程节选