形容词
中文翻译：互惠的
同义词：
['mutual', 'reciprocal']
例句：
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1. The two companies are in a reciprocal agreement to collaborate on research.
两家公司之间有一项互惠协议，共同进行研究。
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2. The reciprocal of 3 is 9.
3的倒数是9。
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3. In a reciprocal exchange, each party gives back what the other has received.
在互惠交换中，每一方都会回报对方所收到的东西。