Birds have wings; they're free; they can fly where they want when they want. They have the kind of mobility many people envy.

Birds have wings; they're free; they can fly where they want when they want. They have the kind of mobility many people envy.

鸟有翅膀;他们是免费的;他们可以随时飞到他们想去的地方。他们拥有许多人羡慕的那种流动性。

-- Roger Tory Peterson 罗杰·托里·彼得森