一些会飞。
也许其中一些祖鸟会爬树，但是没有令人信服的分析证明始祖鸟是如何用它的前肢既爬又飞的。
Perhaps some of them could climb trees, but no convincing analysis has demonstrated how Archaeopteryx would have both climbed and flown with its forelimbs.
一些鸟会往南飞，其他的鸟往北飞。
Some birds will fly away to the south, other birds will fly north.
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