河馬的用法和樣例：
例句
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讓我看看，有河馬，老虎，獅子，駝鳥，孔雀，駱駝，驢，狼，狐狸，鹿。。。
Let's see? There're hippos, tigers, lions, ostriches, peacocks, camels, donkeys, wolves, foxes, deer ... -
孩子們喜歡看河馬在泥中打滾。
The children enjoyed watching the hippopotamus wallowing in the mud.
