我们学习了世界贸易的背景知识的翻译：We learn the background knowledge of the world trade 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

We learn the background knowledge of the World Trade

We learn the background knowledge of the world trade

We have studied the world trade background knowledge

We have been studying the background knowledge World Trade

We learn the background knowledge of the world trade