模仿动物叫声和动作，增加趣味性。
Ask students to imitate the sounds and actions the animals make.
当然，要增加趣味性，必须获得多个用户和修改集合。
Of course, to make it interesting, we have to get multiple users and changesets involved.
不过将来游戏里会有一些新的要素来增加趣味性，但我现在还不能告诉你新要素是什么。
But, well, there's some other stuff coming in the future that will add some interest to that. I can't talk about it now.
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