be made of,由.制成且材料不发生化学变化
Chair is made of wood
椅子是木做的（没发生化学变化）
be made up of,由.组成
China is made up of many provinces
中国由很多省组成
be made from,由.制成,材料发生了化学变化
Paper is made of wood
纸是木做的（发生了化学变化）