It is much colder today that of yesterday.为什么用that of

问题描述:

It is much colder today that of yesterday.为什么用that of
为什么有of

是It is much colder today than that of yesterday吧? that 指代天气不是跟昨天比 而是跟昨天的天气比 所以要用that of yesterday 表示昨天的天气