be made of 是个词组. be made of 表示制成成品后,仍可看出原材料是什么,保留原材料的质和形状,制作过程仅发生物理变化.如: The paper is made from wood.纸是木头做的. The kite is made of paper.风筝是用纸做的.
be made of ... 由...组成 made 是make 的过去分词
be made of 表示制成成品后,仍可看出原 材料是什么