carry on / conduct a trade

做生意

The organization promotes fair trade with developing countries.

该组织提倡同发展中国家进行公平贸易。

the building / food trade

建筑业/食品业

My father is a doctor by trade.

我爸爸的职业是医生。

England trades with nearly all the countries in different things in the world.

英国几乎与世界上所有的国家进行不同商品的贸易往来。

He traded his pen for a knife with me.

他用笔跟我换了一把刀。