一个物体若要在某一点处处于转动平衡，在这一点处的总力矩必须为零。
For an object to be in rotational equilibrium about a certain point, the total torque about this point must be zero.
由于较低部位的电缆比较高部位的电缆移动慢，上升的电梯箱将落后于转动锚点，这样就会引起一个拖拽并可能进一步破坏整个装置的稳定。
Since the lower regions of the cable are moving slower than the higher ones, a rising car will lag behind the orbiting anchor, causing a drag on the cable that could destabilize the entire assembly.
她可能会转动地球仪，用手指随意一点，点到哪儿，就决定去哪儿。
She might spin a globe, place her finger on a random spot, and decide to move there.
应用推荐