名词
中文翻译：往返的
同义词：
['reciprocal', 'reciprocalaction']
例句：
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1. The traintravels back and forth between the twocities.
火车在两个城市之间来回行驶。
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2.The teacher gave a reciprocatinglecture to the students.
老师对学生进行了一次来回的演讲。
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3. The team practiced reciprocating drills before the game.
在比赛前，球队进行了来回练习。