unit of trading

例句：

1. 1. The company's new product isa unit of trading that can be boughtand sold on the stock market.
   该公司的新产品是一个可以在股票市场上买卖的交易单位。
2. 2. Thetrader needs to know the unit oftrading for the commodity he isbuying or selling.
   交易员需要知道他要购买或出售的商品的交易单位。
3. 3. The exchange ratesare based on the unit of trading usedby the international currency market.
   汇率是基于国际货币市场使用的交易单位的。