1. Shanghai rates as the biggest trade centre in China.
   上海是中国最大的贸易中心。
2. He trades in silk.
   他经营丝绸贸易。
3. Trade was depressed by the rise in oil-prices.
   石油价格上涨使贸易不景气。
4. He Bought a trade-in for a very low price.
   他以低价买了一个折价物。
5. We should expand trade in goods and services.
   进一步扩大商品和服务贸易。

　1个动词解释