N-COUNT A hippopotamus is a very large African animal with short legs and thick, hairless skin. Hippopotamuses live in and near rivers. 河马
At older lake sites, there's fossil remains from hippopotamuses, water buffalo, animals that spend much of their lives standing in water, and also, fossils of cattle.
在较老的湖泊遗址，有河马、水牛的化石遗迹，这些动物一生中大部分时间都站在水里，还有牛的化石。
Baby hippopotamuses are born on land.
小犀牛在陆地上出生。
Hippopotamuses like to stand in the grass and eat most of the day.
河马喜欢站在草丛中，一天中的大部分时间它们都是在进食。
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