stirt中的silk用be made of 还是be made from

问题描述:

stirt中的silk用be made of 还是be made from

用be made from,虽然两个都可以表示由什么制成,但是区别就在be made of 用于当看得出原材料时,be made from
用于看不出原材料时,silk是丝绸,看不出原材料.