2 sentences

1. 鱼和蝌蚪都有鳃。

   yú hé kē​dǒu dōu yǒu sāi.

   Both fish and tadpoles have gills.

   Source: AI Challenger 2017

2. 海蛇没有鳃，必须经常浮出水面呼吸。

   hǎi​shé méi​yǒu sāi, bì​xū jīng​cháng fú​chū​shuǐ​miàn hū​xī.

   Sea snakes do not have gills and must surface regularly to breathe.

   Source: CCMatrix