Pupils are black because most of the light that enters them is absorbed.

瞳孔是黑色，因为进入瞳孔大部分光线被吸收了。

Her pupils were dilated. Her expression was vacant.

她瞳孔扩张，表情很茫然。

Your pupil contracts when you're imagining the bright thing just like it does if I look up at the light.

想象光亮物体时人瞳孔会收缩——就像人抬头看光时瞳孔反应。

Well, obviously we can't control the size of our pupils, but dimming the lights will expand them.

显然我们无法控制瞳孔大小，但调暗光线会扩大瞳孔。

The men described the woman with small pupils as cold, hard, and selfish.

两名男子都形容瞳孔小女子冷酷、冷酷、自私。

It turns out that pupil shape is a powerful indicator of what role an animal plays in its ecosystem.

原来，瞳孔形状可以有力地说明动物在其生态系统中扮演角色。

Their pupils that can see through the texts of time.

她有看透岁月篇章瞳孔。

So, why do we have round pupils?

那么，为什么我们瞳孔是？

The center of one's eye, the pupil, is dark and round.

眼睛中心是瞳孔，瞳孔是暗色、形。

Even really good actors probably can't control their pupils.

再好演员也没法控制自己瞳孔。

Their pupils adjust to any lighting like magic.

它们瞳孔能神奇地适应任何光线。

Yeah, but her pupils are reactive.

但是她瞳孔有反应。

And the woman with larger pupils was described as soft, more feminine, and pretty.

而瞳孔较大女性则被描述为温柔、更有女人味、更漂亮。

Her enormous pupils focused on Harry.

她那两只巨大瞳孔盯住了哈利。

Your pupils are really dilated, so much light is getting through.

你瞳孔真放大了，有很多光线透过。

Also, the affected pupil becomes dilated and fails to constrict in response to light.

此外，受影响瞳孔会放大，对光反射消失。

And because of how the slit pupil takes in light, it creates sharp, vertical contours.

由于瞳孔狭缝吸收光线方式，它形成了尖锐垂直轮廓。

Lastly, your pupils sometimes dilate if you're in love or if you're aroused.

最后，当你恋爱或被唤醒时，你瞳孔有时会放大。

It is always round, however bright the light may be.

不管光线怎么强烈, 瞳孔一直是。

Harry saw is pupils contract to thin slits, saw the skin around his eyes whiten.

哈利看到他瞳孔缩成了两条窄窄细缝，看见他眼睛周围皮肤变白了。