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1·Baboons have a large head, cheek pouches, and a long, doglike muzzle.

狒狒头部硕大，有颊囊，鼻口部狭长似狗。

2·Baboons have a large head, cheek pouches, and a long, doglike muzzle. They walk on all fours, carrying the tail in a characteristic arch.

狒狒头部硕大，有颊囊，鼻口部狭长似狗。以四肢行走，行走时尾巴呈特有弓形。

3·Recently unearthed fossils trace whales to a doglike predecessor of hoofed plant-eaters, and genetic analysis has identified hippos as whales' closest living relatives.

最近出土的化石使鲸的祖先可追溯到一种有蹄外形像狗的植食动物，而且基因分析证实了现存动物中河马是鲸的近亲。