4 sentences

1. 为什么猫有垂直瞳孔？

   wèi​shén​me māo yǒu chuí​zhí tóng​kǒng?

   Why do cats have vertical pupils?

   Source: CCMatrix

2. 瞳孔是眼睛中央的黑色部分。

   tóng​kǒng shì yǎn​jing zhōng​yāng de hēi​sè bù​fen.

   The pupil is the black part in the center of the eye.

   Source: CCMatrix

3. 有趣的是，章鱼也有长方形的瞳孔。

   yǒu​qù de shì, zhāng​yú yě yǒu cháng​fāng​xíng de tóng​kǒng.

   Interestingly, octopuses also have rectangular pupils.

   Source: CCMatrix

4. 人类有圆形的瞳孔，但你可以在不同的动物身上看到其他形状。

   rén​lèi yǒu yuán​xíng de tóng​kǒng, dàn nǐ kě​yǐ zài bù​tóng de dòng​wù shēn​shang kàn dào qí​tā xíng​zhuàng.

   Humans have round pupils, but you may see other shapes in different animals.

   Source: CCMatrix