be made of和be made from的用法区别

be made of和be made from
*be made of指从所制成的物品中能看到原材料,即原材料只发生了物理变化。如:
Our desks and chairs are all made of wood.
*be made from指从所制成的物品中看不出原材料,或者说是原材料发生了化学变化。如:
Some paper is made from wood.
注意:
有时,在制成品中很难断定能否看出原材料,这时be made后用of或from皆可。如:
Bread is made of/from flour.

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