说明︰此句型意为A 之于 B 犹如 C 之于 D。等于A is to B as C is to D.或What C is to D (that) A is to B或As C is to D so is A to B。这是为了让人明白 A 与 B 的关系，而利用人所熟知的 C 与 D 的关系来比喻的句法。what 是A is to B之 be 动词补语.

Exercise is to the body what thinking is to the brain.

运动和身体的关系，如同思考和头脑的关系。

What lungs are to the animal， leaves are to the plant.

就像肺是动物所不可缺的一样，叶子也是植物所不可或缺的。

As water is to the plant， so are books to me. 书和我的关系正如同水和植物的关系。

what with and

结构︰what with and (what with)

说明︰此句型意为一方面因为一方面因为。等于half through (half through) 、partly because (of) (partly because (of)) 。

What with laziness and (what with) illness， he lost his job.

一方面因为懒，一方面因为生病，他丢了工作。

What with the wind and what with the rain， our trip was ruined.

又是刮风又是下雨，我们的旅游都给搞砸了。

What with the high prices， and what with the badness of the times， we find it hard to get along. 部分因为物价高涨，部分因为时机不好，生活真是愈来愈难过了。

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