A teacher is telling his students, “The moon is very large. Several millions people can live there.” 

一位告诉学生：“月亮非常大，上面能住几百人。”

And a boy laughs and says, “It must get crowded when it’s a crescent moon.”

一个男孩笑着说：“当月亮变成月牙的时候，住在上面的人该多拥挤啊！”