Fish take in oxygen through their gills.

鱼用鳃吸取氧气。

Both fish and tadpoles have gills.

鱼和蝌蚪都有鳃。

You won't ever find feathers on a mammal or gills on a primate.

你在哺乳动物身上找不到羽毛，在灵长类动物身上找不到腮。

The gills of fishes are analogous to the lungs in terrestrial animals.

鱼类的鳃与陆上动物的肺类似。

The behemoths are indeed sharks. They breathe through gills, like fish.

事实上，这些庞然大物确实是鲨鱼。它们通过鳃呼吸，就像鱼一样。