be 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。
纸是由木头制成的英文是Paper is made of wood。
be 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。
