名词
中文翻译：交换
同义词：
['trade', 'swap', 'interchange']
例句：
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1.They exchanged pleasantries with each other before the meeting.
会议前，他们彼此问候。
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2.The two countries have been exchanging diplomatic notes since the signing of the peace treaty.
自和平条约签署以来，两国一直在交换外交照会。
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3.Exchange rates fluctuate daily, affecting the value of currencies.
汇率每日波动，影响货币价值。