名词
中文翻译：往返运动
同义词：
['circular motion', 'reciprocal movement']
例句：
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1. The car moved back and forth across the street.
汽车在街道上来回移动。
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2. The ball bounced back and forth between the two players.
球在两名球员之间来回弹跳。
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3. The train made round trips to the city every day.
火车每天往返于城市之间。