科研之友
微信
新浪微博
Facebook
分享链接
摘要
<正>One day, Johnny and his parents visited achicken farm. When they came near the incubator(孵卵器), a chick just got out of its eggshell."It’s wonderful to see a little thing come outfrom the eggshell, isn’t it?"Johnny’s mom said."Yes," said Johnny."But it would be morewonderful if we knew how a chick gets into itseggshell before hand."
