hippopotamus|hippopotamuses

搬这个大行李箱简直像在拖一只河马。

Carrying this huge suitcase is like dragging a ___hippopotamus around.

搬运这些沉重的箱子感觉就像在移动一群河马一样费力。

Carrying these heavy boxes felt like moving a group of ___hippopotamuses.

河马在泥浆里打滚以保持皮肤湿润。

The ___hippopotamus rolls in the mud to keep its skin moist.