一个关于比较的语法求助

henryuan

The proportion of people who die in their seventies is significantly smaller today than is the proportion of people who die in their eighties.

这是逻辑OG第一题的一个选项，我想问的是，为什么than 后的is 不去掉，应该是The proportion of people who die in their seventies 和the proportion of people who die in their eighties.进行比较，Than 后的IS 显得多余？

求指导，谢谢！

henryuan

GOT IT,谢谢！

wangjieava23

这个is是必须有的。这样做到 The proportion of people who die in their seventies
                                       与   the proportion of people who die in their eighties 的比较；
                   而不是  significantly smaller
                                        与   the proportion of people who die in their eighties 的比较
楼上还是看看论坛里关于比较的那个“庖丁解牛”，会有启发的。