direction change 换向
- The horse of Grunsven showed excellent skills in the varying of each pace and direction changes.
格林斯文的马在每种步态和方向的改变方面表现了很好的技能。 - If the speed doesn't change, then the velocity, of course, does change because the direction changes all the time, but the speed does not.
若速率恒定,那么速度当然会变化,因为方向时刻是变化着的,但是速率没变。 - Lift machine should have two independent contactors to shut off: if one main contactor does not shut off during stopping, rerunning can be prevented before the running direction changes.
电梯驱动主机应有两个独立的接触器切断电源:停车时如其中一个的主触头未断开,最迟至运行方向改变时就能防止再运行。
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