分析下列句中结构，说明as在本句作用？

Question

neon is to Hong Kong as red phone booths are to London and fog is to San Francisco.

Answer 1

英语中有一结构：A is to Be what C is to D
A 对于B如同C对于D一样。
我认为as在此相当于what

Answer 2

同时的意思。

Answer 3

指正像，正如的意思。

Answer 4

回答: 本句所用的固定句型为:
A is to B as / what C is to D and E is to F. A 对于B来说, 犹如C对于D、E对于F。
句型结构分析:
主句: A is to B(主语A+作合成谓语的系表结构，其中介词短语to B是表语，to表示对比)。
类比状语从句: as / what (作连词)…。
本句型还可以转换为下面的句型:
1. What C is to D(and E is to F), that A is to B.
其中What …是从句，that(不能省略) A is to B是主句。
2. (Just) As C is to D (and E is to F)，so A is to D. 例如:
Air is to man what / as water is to fish.
= What water is to fish, that air is to man.
= (Just) As water is to fish, so air is man.空气对于人犹如鱼对于水。
本句翻译: 霓虹灯对于香港犹如红色电话亭对于伦敦、迷雾对于洛杉矶。本回答被提问者采纳