I know v zero x, that is v zero cosine alpha xt=t so x of t is v zero cosine alpha times t but there is no acceleration, so that's it.

并且v0x=v0cosα,那么可有得出,因为没有加速度，所以就是这样了。

youdao

So, at that point, the partial derivative is zero with respect to x.

因此这点上x的偏导为零。

youdao

So, x goes from zero to one. OK, and now, see how in the inner integral, the bounds depend on x.

所以，x的范围是从0到，来看看内积分的积分范围，是怎样取决于x的。

youdao

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

耶鲁公开课 - 基础物理课程节选

So I simply print, highlight, and give a big "X" and a zero.

我会简单地打印一下，标记出来，然后打一大把叉，给个零分。

对于抄袭的想法 - SpeakingMax英语口语达人

The violin string extends from x equals zero to x equals L, and we pluck the violin string.

弦从X轴指向原点,让x等于L，然后我们拉直那根弦。

麻省理工公开课 - 固态化学导论课程节选

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