求以下这段英语的知识点?

题目

求以下这段英语的知识点?
Every time we walk into a store,restaurant,theater or any other place of business to buy someting,
每次我们走进一家商店、饭店、剧院和其他任何地方的商业买东西,
we trade.
我们的贸易.
Basically,
基本上,
international trade does not differ from trade with other people in our country .
国际贸易不是不同于贸易与其他我们国家的人民.
The key to understanding trade is to remember why it takes place .
理解的关键是要记住它为什么交易发生.
The reason people trade ,regardless of where they live ,
人们贸易,无论他们住在哪里,
is that they belive they will be better off by trading.
是,他们相信他们将会更好的交易.
When we consider the alternative --each of us producing everything for ourselves--trade simply makes more sense
当我们考虑替代——我们每个人都为自己生产,贸易更合理
翻译是有道翻译的!求列举几个知识点,

答案

嗯，谢谢！