舞者要阻止从空中掉落的惟一方法便是中止自己的动量，而这需要一个反面的来自一个平面的阻力。
The only way a dancer can stop dropping through the air is by stopping the body's momentum, which requires an opposing force-the ground.
舞者要阻止从空中掉落的惟一方法便是中止自己的动量，而这需要一个反面的来自一个平面的阻力。
The only way a dancer can stop dropping through the air is by stopping the body's momentum, which requires an opposing force-the ground.
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