如题所述
be made of表示由成品能看出原材料，也就是物理变化。
be made from则表示由成品看不出原材料，也就是化学变化。
举例：
Only the rough guess and estimate can be made of it.
对此只能作出一个粗略的测算。
The taps appeared to be made of solid gold.
水龙头似乎是用纯金制成的。
Returning to developments in the United states, mention must be made of theprogress in shipboard catapults.
当回头追述美国取得的进展时，必须提及舰用弹射器的进步。
Have you decided which material you would like the suit to be made from?
你想好了用什么面料做衣服了吗？
A choice that can be made from menus.
一种能够从选项单〔菜单〕中所做的选择。
Future buildings, roads, and cities may be made from garbage.
将来的建筑物、公路和城市都可能用垃圾制成。
How many necklaces can be made from four beads, two blue, one red, and oneyellow?
用四颗珍珠&两蓝色、一红色和一黄色可做成多少种不同的项圈？
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