A education campaign should be launched to inform citizens that proper rules are of benefit to public safety 这句话里面为什么are
问题描述：
A education campaign should be launched to inform citizens that proper rules are of benefit to public safety 这句话里面为什么are和benefit中间有个of?
答
be of 加名词等于形容词的作用,例如,of worth =worthy
这里的are of benefit 就是be beneficial的意思嗯嗯，受益了！谢谢