Man was evolved from an ancestor that was probably arboreal.

住在树上的祖先进化而来的。

Squirrels are arboreal creatures.

松鼠栖于树上的动物。

Any of various small arboreal marsupials of the family Phalangeridae, of Australia and adjacent islands, having a long tail and dense woolly fur and including the cuscus and the flying phalanger.

袋貂结趾科中的一种栖于树上的小型有袋动物，生长在澳利亚及其毗临岛屿上，有长尾和浓密的皮毛，包括袋猴和飞行袋貂。