名词短语
中文翻译：交换类
同义词：
['exchange class', 'category of exchange']
例句：
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1. The class of exchange is determined by the type of commodity being traded.
交换类由正在交易的商品类型决定。
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2. This class of exchange is not suitable for all types of transactions.
这种交换类不适合所有类型的交易。
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3. The classification of exchange classes helps to understand the economic implications ofinternational trade.
交换类的分类有助于理解国际贸易的经济影响。