If the mediocrity principle is true, alien life probably exists, in some form, elsewhere in our galaxy.

如果平庸原则是正确的，那么外星生命可能以某种形式存在于我们银河系的其他地方。

If the mediocrity principle is true, and there is  a high probability an alien species exists in our galaxy, why haven't we heard from them?

如果平庸原则是正确的，并且我们的银河系中极有可能存在外星物种，为什么我们没有收到他们的消息？

According to the mediocrity principle, the  evolution of our solar system, and the properties that eventually led to the evolution of life, may  not be unusual in the universe.

根据平庸原则，我们太阳系的演化，以及最终导致生命演化的特性，在宇宙中可能并不罕见。