trade可数。trade主要用作名词和动词，作名词时意思是：贸易；买卖；商业；交易；行业；职业；生意；同业；同行；同人。作动词时意思是：做买卖；做生意；从事贸易；营业；营运；(在证券交易所)交易；买卖
一、trade词态变化第三人称单数：trades复数：trades现在分词：trading过去式：traded过去分词：traded
二、trade短语搭配tradedown变卖（旧物）换进同类中较廉价的东西tradein以（旧物）折价贴换同类新物tradeoff以…换取tradeup变卖（旧物）换进同类中更贵的东西
三、trade双语例句
1.Share prices had perked up slightly by close of trading.
收盘时股价略有上扬。
2.he was surrounded by the tools of her trade.
她周围都是她干活用的工具。
3.The crisis had a negative effect on trade.
这次危机对贸易产生了很坏的影响。
4.The company has a virtual monopoly in this area of trade.
这家公司实质上已经垄断了这种贸易。
