It's bad for your eyes to read in the sun为什么有个to

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It's bad for your eyes to read in the sun为什么有个to
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It's bad for your eyes to read in the sun为什么有个to
It's bad for your eyes to read in the sun为什么有个to

It's bad for your eyes to read in the sun为什么有个to
it is ……to+动词是标准句型

to read in the sun 才是真正的主语。。这叫不定式主语后置。
前面用it 作为指代主语。