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At night, the pupils dilate to allow in more light.
The sick man's pupils were dilated.

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Open the tool →瞳孔 (tóng kǒng) means “pupil”.
瞳孔 is pronounced tóng kǒng in Mandarin Chinese.
“pupil” is 瞳孔 (tóng kǒng) in Chinese.
This page has 2 example sentences using 瞳孔, each with pinyin and an English translation.