我们知道“东”、“西”是两个相对的方向。

We know that the east is opposite to the west.

youdao

肌腱和肌肉也提供骨头向相对的方向运动的力量。

The tendons and muscles alsoprovide a force to move the bones relative to each other.

youdao

肌腱和肌肉也提供骨头向相对的方向运动的力量。

The tendons and muscles also provide a force to move the bones relative to each other.

youdao

But things which were at rest will move at a constant velocity, opposite of the velocity that you have relative to me.

这些静止的东西都在匀速运动,方向正好跟你相对我运动的速度方向相反

耶鲁公开课 - 基础物理课程节选