If you spin a top, that we know that the top will not last very long because of friction.

如果你转一个陀螺，你会发现因为摩擦力，陀螺不会永远旋转。

youdao

If you spin a top, that we know that the top will not last very long because of friction.

如果你转一个陀螺，你会发现因为摩擦力，陀螺不会永远旋转。

youdao