能看出原材料，用be made of。
例如：The taps appeared to be made of solid gold.
相关介绍
Families must be made awareo of field trips and give permission for their children to participate.
每个家庭应该对实地考察有一定认识且允许孩子参加。
It was a rare honour to be made a fellow of the college.
成为这所学院的研究员是极大的荣誉。
We have been instructed that a decision will not be made before the end of the week.
我们已获悉周末前不会作出决定。
