By muscular contraction he can create a pressure on an outward object,which,if sufficiently powerful,will set it in motion,or if it be already moving,will check or modify or altogether arrest its motion,and he can do no more.

 
  • 靠着肌肉的收缩,人能给予外物以压力,压力如果足够强的话,可使外物产生运动,如果物体已在运动中,则可以阻止,改变或完全停止其运 动。
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