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空调
pillow
枕头
light
blanket
毛毯
be made of由…制成
The window is made of glass .
glass
window
door
wood
The door is made of wood.
cotton
blanket
The blanket is made from cotton .
be made from由…制成
cotton
pillows
The pillows are made from cotton .
Let's sum up
be made of 由某种材料做成，看得出原材料，是物理变化。
be made from 由某种材料做成，看不出原材料，是化学变化。
The window is made of glass .
The door is made of wood.
The blanket is made from cotton .
The pillows are made from cotton .
A: What’s the air-conditioner made of?
B: It’s made of metal.
A: What’s it used for?