Each has his own tree of ancestors, but at the top of all sits Probably Arboreal.

Each has his own tree of ancestors, but at the top of all sits Probably Arboreal.

每个人都有自己的祖先树，但在所有树的顶端可能是树栖的。

-- Robert Louis Stevenson 罗伯特·路易斯·史蒂文森