而且我们这个行星，就是地球还绕着自己的轴自转。

And our planet, earth, rotates on its own axis.

youdao

先前在讲行星时,我们讨论过这个，我们讨论的是,匀速圆周运动，而且我们评估了,向心加速度。

We have discussed that earlier when we dealt with the planets, and we dealt with uniform circular motions, and we evaluated the centripetal acceleration.

youdao