Fast hands and high elbows are two of the most important concepts in swimming, but are sometimes hard to grasp while you're swimming.
手很快和高肘是两种最重要的概念在游泳时，但有时很难理解当你游泳。
He's still that fast, but now he's much stronger and can dunk. Smith noticed that his hands were also a lot bigger.
他的速度仍然是那么快，只是现在他健壮了许多并且也能扣篮了。史密斯注意到，他的手也大了不少。
She moves her arms and hands slowly but her feet move in fast difficult steps.
她的胳膊和手移动得很慢，但她的脚移动得很快。
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