I think there's a value in taking the time out.
很有必要抽出一点时间。
But usually, if you are not able to work out something in terms of taking the exam at a different time,
不过通常情况下,你不太可能被允许换个时间参加考试,
Yeah, I'm like taking some time out to do a bit of work
是的,我喜欢暂时停下来去做点别的工作,
So, the average is found by taking two instants in time, say t1 and later t2, and you find out where it was at t2 minus where it was at t1 and divide by the time.
平均速度就是取两个时刻,比如t1和之后的t2,用t2时刻的位移,减去t1时刻的位移,再除以这段时间
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