trade something with someone 用什么和谁换
trade something for something 用什么换什么那么trade sth with sth是什么意思用 with的时候，后面的那个sth可以理解为someone[和谁交易]，而不是要交易的"东西"
比如trade something with the company; trade your books with other people
如果是表达[东西交易东西]，用for
trade gold for money.