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Teacher:
Kids, pay attention to the incubators. 
孩子们注意看一下孵蛋器。
Kids:
What's this for?
这是做什么的？
Teacher:
You can see the little chick come out from the egg shell.
你们会看到有小鸡从蛋壳里钻出来。
Kids:
Where？
在哪？
Teacher:
Over there, isn't it amazing?
就在那边，多么奇妙啊！
Kids:
But how they get into the eggs shell before?
但是它们是怎么事先钻进蛋壳里的呢？