For instance, the pupils of women and infants (but not men) spontaneously dilate when they see babies. Pupil dilation is an honest indicator of interest and attraction.
一种解释是，当一个人面对她所喜爱的东西的时候，她的瞳孔会自然扩张，例如，女人和幼儿（没有男人）在看到婴儿时，她们的瞳孔会自动放大。
Eyedrops placed in your eye dilate your pupil. You'll receive local anesthetics to numb the area, and you may be given a sedative to help you relax.
医生会给您滴一些散大瞳孔的和局部麻醉的眼药水，以及使用一些镇静药物来帮助您放松。
Living underground can depress production of the chemicals that help dilate and contract the pupil in response to changes in light.
由于长期处于地下，作为对光照减少的反应，帮助瞳孔扩张和收缩的化学物质的产生会相应减少。
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