And with good reason: being able to manipulate the expectations of those around us is a key survival trait for social animals like ourselves.

而且还有很好的理由：能够巧妙地操纵周围人的期望是像我们一样的社会性动物的一种主要特征。

Ministry policies like banning Muggle-born children from attending Hogwarts might reduce the number of Muggle alleles in wizarding society and thus increase the survival chances of magic as a trait.

魔法部如果采取禁止麻瓜出身的孩子在霍格沃茨读书的政策可能会减低麻瓜等位基因在巫师界的数目，因此增加魔法特征的生存机会。