先有雞.后有蛋等
2010-12-31 00:00:00
英語(yǔ)學(xué)習(xí) 2010年10期
British scientists think they have the answer tothe age-old riddle of whether the chicken or theegg came first.
Researchers at the Universities of Sheffield andWarwick， in northern and central England， say thesecret lies in the eggshell， and specifically in thevital role played by a chicken protein' in forming it.
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