be used of和be used from的区别
2个回答

e made of 用什么做成的(可以看出制作材料,例如window is made of glass)

be made from 用什么做成的(不可以看出制作材料,例如wine is made from grape)

另附加:be made in 是在哪里制造,生产

be used as 被当成...来用

be made into 被做成什么

都是被动语态