鸡被作为卵生动物的代表，一些已经灭绝的爬行动物可能在进化过程中将基因传给了鸭嘴兽和其他哺乳类。
Chickens were included to represent egg-laying animals, such as extinct reptiles, that passed on much of their DNA to the platypus and other mammals in the course of evolution.
蓝飞公司的行动可能会最终破解“鸡生蛋还是蛋生鸡”的问题。
Bluefly's move may finally help to crack this chicken-or-egg problem.
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