You need that light background for the pupil to work appropriately to minimize the amount of light coming in.

为了让瞳孔缩小，减少进入眼睛的光线，你就需要有一个明亮的背景。

Their anger made their pupils small.

愤怒使他们的瞳孔缩小了。

His eyes were dull, with the pupils shrunken, and the skin of his neck hung in yellow, pulpy folds.

他的眼睛无神， 瞳孔缩小，脖子上的皮肤呈黄色， 呈浆糊状。

Doctors say the victims had breathing problems, pale skin, sweating, narrow pupils, all systems of a chemical attack.

说， 受害者有吸问题、皮肤、汗、瞳孔缩小，所有系统都受到了化学攻击。

Why, is one of my pupils getting all small?

为啥 我的其中一个瞳孔又缩小了吗？

Things like: open mouths, wide or small pupils, blinks, nose licks, whisker movements and ear positions.

这些面部动作包括：张嘴、瞳孔变大或缩小、眨眼、舔鼻子、胡须动作和耳朵的转动。

Horner syndrome involves miosis or constriction of the pupils, ptosis or the drooping of the eyelid, and anhidrosis which is an inability to sweat in the face.

Horner综合征包括瞳孔缩小、上睑下垂以及面部无汗。

When this nerve is injured, it causes Horner's syndrome, which is a triad of three symptoms: meiosis or constricted pupil, ptosis (a droopy eyelid), and anhidrosis (the inability to sweat).

T1受损会引起Horner综合征，由一组三联征构成——瞳孔缩小、上睑下垂、无汗。

This leads to Horner's syndrome on the same side of the face as the lesion, which include symptoms of miosis or constricted pupil, ptosis or droopy eyelid, and anhidrosis or failure to sweat.

这会导致在病损同侧脸部现霍纳综合征，症状包括瞳孔缩小、眼睑下垂与脸部无汗。

In fact, cat pupils are so flexible that their maximum area is 135 times greater than their minimum area — whereas our pupils only shrink and expand 15-fold.

事实上，猫的瞳孔非常灵活，它们的瞳孔最大面积是最小面积的 135 倍，而我们的瞳孔只能缩小或扩大 15 倍。

If a pancoast tumor pushes on or invades these sympathetic nerves, it can cause miosis - a small or constricted pupil, ptosis - a droopy eyelid, and anhydrosis - a failure to sweat, all on the ipsilateral, or same side, of the face as the nerve.

如果肺上沟瘤向上挤压或侵袭交感神经，则会现瞳孔缩小、上睑下垂、无汗等症状，这些都发于神经支配的同侧面部。