The noun 河马 (hémǎ) means "hippopotamus." It is a compound word made up of 河 (river) and 马 (horse), literally meaning "river horse." It is used to refer to the large semi-aquatic mammal native to Africa.
动物园里的河马正在水里泡澡呢。
Dòngwùyuán lǐ de hémǎ zhèngzài shuǐ lǐ pào zǎo ne.
The hippo at the zoo is soaking in the water.
河马虽然看起来笨重,但跑得其实很快。
Hémǎ suīrán kàn qǐlái bènzhòng, dàn pǎo de qíshí hěn kuài.
Although hippos look clumsy, they can actually run very fast.
孩子们最喜欢看河马张大嘴巴的样子。
Háizimen zuì xǐhuān kàn hémǎ zhāng dà zuǐba de yàngzi.
Children love watching hippos open their mouths wide.