请分析一下“A is to B what C is to D”这个句子的结构?

帮忙分析一下这个句子的成分：A is to B what C is to D . A is to B,what C is to D.想请英语高手分析下此句中what 的成分以及这是什么 A is to b what c is to d A is to B as/what C is to D 帮忙分析一下这个句子的语法结构吧that is all there is to it A is to B what C is to D 的句型,将what从句放句首 A is to B what C is to D 的句型,将what从句放居首 关于A is to B what C is to D 的句式 谁知道“A is to B what C is to D”的例句? 句式A is to B what C is to D的用法 Smoking is a major factor contribute to cancer.请分析一下这个句子. what A is to B is what C is to D