如果你再这样做一次，可以看到该点来到顶部，又回到底部，然后又开始新的一轮运动。

So, if we do it once more, you see the point now is at the top, and now it's at the bottom. And then we start again.

youdao

如果你再这样做一次，可以看到该点来到顶部，又回到底部，然后又开始新的一轮运动。

So, if we do it once more, you see the point now is at the top, and now it's at the bottom. And then we start again.

youdao