由...所组成

be made of/be made into/be made up of
Nearly everything inside their houses is made of bamboo.他们家中的东西几乎样样都是用竹子做的。
Bamboo is also made into paper.竹子也可以用来造纸。
We sometimes tend to think that the ocean bottom is made up of smooth plains.我们有时会想，大洋底部全是（由）光滑的平原（构成的）。
<辨析>这三人短语的含义不同。be made of 意为“由......原料制成”，主语为制成品，介词宾语为原材料。be made into 意为“把......做成......”，主语为原材料，介词宾语为制成品。试比较以下两句：Bottles are made of glass.瓶子是用玻璃制成的。Glass is made into bottles.玻璃可制成瓶子。be made up of 指事物的构成成分，意为“由......构成（组成）的”。