名词
中文翻译：交换
同义词：
['trade', 'swap', 'transact']
例句：
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1.They exchanged pleasantries before the meeting began.
会议开始前，他们互相问候。
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2. The company exchanges its products with other companies for new ones.
公司与其他公司交换产品以获取新产品。
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3.Exchange rates fluctuate frequently due to fluctuations in foreign currencies.
由于外汇汇率的波动，兑换率经常变动。