对不同鸟类的观察越仔细，你对多种多样的鸟喙的了解就会更深入。
The more closely you begin to examine different birds, the more familiar you will become with the wide range of bills.
某个性状的选择，比如说喙的大小或者其他别的，取决于控制该性状基因的代代传承。
Selection for a trait, be it beak size or something else, depends on passing down the genes for that trait to offspring.
部分专家指出：在一些候鸟上喙的细胞之中，存在铁基磁感应受体，可将磁感应信号经神经传导至大脑。
Some researchers had proposed that iron-based receptors in cells found in the upper beaks of some migratory birds sense the magnetic field and send that information along a nerve to the brain.
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