The shell structure of several-year-old egg is different from that of the newborn.

 
  • 結果表明,兩個(gè)時(shí)期的休眠卵外殼結構有區別,隔年卵外殼較薄,殼紋不明顯; 新卵外殼厚,殼紋明顯。
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