be made up of =consist of 由……組成
consist of 由...組成的.相當(dāng)于be made up of .后面是加組成的成分.
例如:This necklace consists of gold and diamond.
注意,consist 本身是一個(gè)不及物動詞,不能采用被動語態(tài).
be made of/from...都是表示由.制成的.
但是be made of 是可以看得出原料的.例如
The desk is made of wood.
而be made from.是不可以看出原料的.例如
Paper is made from wood.