说明
A is to B what X is to
核心问题
Air is to us what water is to fish. (空气之于我们,如同水之于鱼)。请问句中的 what 是什么词,起什么语法作用?
词典解答
what 在这种句型中是关系代词，在语意上相当于 that which (the thing which)。what 从句在主句中起表语(主语补语)的作用，what 在从句中也起表语(主语补语)的作用。这种句型的语意功能是对两件不同的事情进行对比。主句往往是语意重点之所在，作者常常把它当作读者所未知的内容而加以强调，而从句则表达读者已熟知的内容。通过由已知和未知的对比，读者就能获得新知。例如：
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Railway is to transportation what blood is to a man's body. 铁路对于交通的重要性,就如同血液对于身体的重要性一样。
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Manure is to crops what food is to man. 肥料对于农作物,就如同食物对于人一样。请做下面的英语试题:
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Reading is to the mind ____ food is to the body.
A. what B. that C. which D. of which(大学生竞赛题)
- Intellect is to the mind ____ sight is to the body.
A. what B. as C. that D. like(全国英语专业四级,01-45)
- Nine is to three ____ three is to one.
A. when B. that C. which D. what(全国英语专业四级,08-53)