所以让人继续去说那些语言的真正原因只是因为它们是我们人类共同遗产中不可替代的一部分。
So the reason to keep languages alive is really just because they are an irreplaceable part of our common human heritage.
一个普遍的共同祖先真正的原因在于这23种蛋白质是类似的，西奥博尔德说。
A universal common ancestor is generally assumed to be the reason the 23 proteins are as similar as they are, Theobald said.
Bonter说，至于鸟类这么做的原因，可能是鸟类和浆果植物之间的共同进化。
As for how the birds do it, it would appear to be something that hasevolved jointly between the berry plants and the birds, said Bonter.
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