sale and purchase of ship

例句：

1. 1. The company's main business isselling and purchasing goods.
   该公司的主要业务是销售和购买商品。
2. 2. They conducted a sale andpurchase of ships at the port.
   他们在港口进行了船舶的销售和购买。
3. 3. The governmenthas been involved in manysales and purchases of state-owned assets.
   政府参与了多项国有资产的销售和购买。