through和by都有通过某种方式，方法的意思，有什么区别

through 是通过某种途径

He bought the antique vase through a dealer.
他通过一个商人买到这只古花瓶

He became rich through hard work.
他靠努力工作而致富。

through表示“以；通过；经由”。如：

by 是通过某种方法

1。表示以一般的方法或方式。如：

No one in those days could live by writing poems.

（2）表示传达、传递的方式或煤介。如：

How did you send the letter, by airmail or by ordinary mail?

I came back by bus.
我是乘公共汽车回来的。