哈迪博士说，两者正以相同的速度下降。

Both are decreasing at the same rate, Dr. Hardy said.

youdao

为什么现在阿尔卑斯山会以它上升相同的速度被侵蚀呢？

How does it come about now that the Alps erode at the same speed that they rise?

youdao

这意味着你事实上你需要加快你的的步伐从而达到相同的速度。

This means you actually have to feel like you are picking up the pace just to run the same speed.

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

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