the engine has more than three hundred components,made of a lot of different materials
问题描述：
the engine has more than three hundred components,made of a lot of different materials
这句话made前面是不是还应该有个定语从句引导词
答
把逗号去了
或者made 前加上 which were
the engine has more than three hundred components made of a lot of different materials
the engine has more than three hundred components,which were made of a lot of different materials