arboreal [ɑ:ˈbɔ:riəl]

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adj.树栖的；树的

of or living in trees

Man was evolved from an ancestor that was probably arboreal. 人大概是从住在树上的祖先进化而来的。
Koala is an arboreal Australian marsupial. 考拉是一种澳大利亚树栖有袋动物。