都是被动语态,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
be 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)