名词
中文翻译：Unknown
同义词：
['backward stroke', 'back-stroke']
例句：
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2.
游泳、划船等的
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3.
在比赛中
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1. The swimmer performed a backstroke to reach the other side of the pool.
这位游泳者进行了蛙泳，到达了泳池的另一侧。
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2. The boat reversed its course and headed back towards the shore.
这艘船改变了航线，朝岸边驶去。
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3. In the final lap, the swimmer executed a backstroke to gain an advantage over his competitors.
最后一圈，这位游泳者执行了一个蛙泳动作，以超越对手。