这使旋转耗时两秒钟，缓慢启动，加速，然后在最后再次减速。

This makes the rotation take two seconds, starting out slowly, accelerating, and then slowing down again at the end.

youdao

这使旋转耗时两秒钟，缓慢启动，加速，然后在最后再次减速。

This makes the rotation take two seconds, starting out slowly, accelerating, and then slowing down again at the end.

youdao