e made of意思是“由……制成”,介词of所指的原材料一般是未经变化,仍可看出材料的.例如：
The desk is made of wood.This bridge is made of stone.
课桌是用木头做的.桥是石头造的.
◆be made from意思也是“由……制成”,但介词from所指的原材料往往是经过变化,已看不出原材料的.例如：
Paper is made from wood.The wine is made from rice.
纸是用木头做的.酒是由稻谷制成的.
◆be made in意思是“由（什么地方）生产的”,表示某一物品在某地生产或制成,in后面接表示地点的名词.例如：
This kind of bike is made in Japan.China is mostly made in China.
这种自行车是日本生产的.瓷器主要产生中国.
