Question

be covered by和be covered by有什么区别呢？

Answer 1

1、be covered with 和be covered by 汉语意思相近，都可以翻译成“被/由、、、、、、覆盖”。但是，二者结构本身名称不同。
2、be covered with 叫做系表结构，介词with 后面经常接事物，有时也可以接人。例如：
In cold winter,many parts in North China are covered with snow.
在寒冷的冬季，中国北方很多地方都积雪覆盖。
As we all know, two-thirds of the earth's surface is covered with water.
众所周知，地球表面的三分之二都被水覆盖。
The square is covered with dancing people.
广场上到处都是跳舞的人。

3、be covered by 是被动语态结构，介词by后面跟动作的发出者，经常是人，也可以是事物。例如：
When he got there,he found that the road to the village had been covered by deep snow.
当他到那里时，他发现通往那个村庄的路已经被深深的积雪覆盖。
The pit was filled and covered by soeme students.
这个坑是被一些学生填上并覆盖的。