新概念第四册44课中的一句话的理解44课第二段倒数第二句：Thereisnosocialproblemitismoreincumbentuponustounderstandthanthisoftheroleofcustom.这句话的语法结构看不懂哦.觉得读起来很不顺.怎么

Question

新概念第四册44课中的一句话的理解
44课第二段倒数第二句：There is no social problem it is more incumbent upon us to understand than this of the role of custom.这句话的语法结构看不懂哦.觉得读起来很不顺.怎么都觉得像病句.
这句话能改成There is no social problem which is more incumbent upon us to understand than this of the role of custom.始终不太明白原句中的it是什么意思？是否是省略了that?为什么可以省略呢？

Answer 1

没有任何一个社会问题比得上风俗的作用问题更要求我们必须理解它.
it is more incumbent upon us to understand than this of the role of custom作problem的定语从句.problem和it之间省略了that.this代替problem.to understand是真正的主语,it是形式主语.
只要 搞清楚 no more than 的位置 就不难了