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The pupil becomes smaller in bright light and larger in dim

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The pupil becomes smaller in bright light and larger in dim light.
光线强时瞳孔变小,弱时变大.
small是小的意思,
and两面不应该是对等的吗?and的后面也不对等啊,后面没主语
The pupil becomes smaller in bright light and larger in dim
smaller是small的比较级,这个句子是主系表的结构,and就是连接两个并列的表语smaller和larger,in bright light 和in dim light分别是smaller和larger的后置定语