be made of和be made from究竟有什么区别？

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到底哪个是看得出原材料，哪个是看不出原材料呢？

be made of 看得出
be made from 看不出宽昌

This cup is made of glass.这个杯子是玻璃制作的。
The paper is made from wood.纸是由木材慎逗扒制作指腔的。

be made from由…制核消成(化改森知学变化)
be made of由…制成(物理变化) ...

be made from 由….制成(看不出原料)
be made of 由….制春告成(能看出原料) ...