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

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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 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 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
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

smaller是比较级,更小的意思
and后面省略了主语和谓语,因为和前面的句子主谓一样,可改为the pupil becomes smaller in bright light, and the pupil becomes larger in dim light.

smaller更小 和larger 并列啊!
后面的主语不还是the pupil嘛

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