当它们接近活动视界时候半径阻止了收缩，是与视界平行，而开始在内部分叉。
Radii stop converging as they approach the event horizon, are parallel at the horizon, and begin diverging in the interior.
为了研究早期收缩和膨胀的动态行为，我们开发了一种特殊的装置，它带有两个平行对准放置的激光器。
In order to investigate the dynamics of early shrinkage and expansion we developed a special set-up of two laser units which are horizontally aligned.
在肩部的运动中，阻力，重力和肌肉的收缩力集中于肱骨轴线，通过盂肱关节面转换为与关节盂面垂直的压力和与关节盂面平行的剪力，作用于肩部活动的全过程。
During the pitching motion, the resistance force, weight of the pitching arm and the contraction force of muscles set up a combination force along the pivot of the humerus.
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