名词
中文翻译：Unknown
同义词：
['back stroke', 'backspin', 'backhand stroke']
例句：
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1.The tennis player needs to master the backspin serve to win matches.
这位网球运动员需要掌握反手发球来赢得比赛。
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2. The gymnast performed a backspin on the balance beam, impressing the audience.
体操运动员在平衡木上进行了反手旋转，给观众留下了深刻印象。
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3. In swimming, the backspin stroke is used to propel the swimmer forward.
在游泳中，反手划水是推动游泳者前进的一种方式。