我是回来找你的。
I came back for you, and then I abandoned you all over again.
我回到了你身边,接着又一次冷落了你。
I don't know why I came back for you. No explanation will ever be good enough.
我不知道我为什么要来找你,没有任何解释能足够说明那点。
For example, if you started here and you did all this and you came back here, the average velocity would be zero, because you start and end at the same value of x, you get something; 0 divided by time will still be 0.
例如,如果你从这里开始运动,经过这个过程又回到这里,平均速度就是0,因为初态和末态的位移相同,你得到了什么呢,0除以时间还是0
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