The Pontiff celebrated mass in Mexico City.

教皇在墨西哥城主持了弥撒。

He is the first pontiff to resign in 600 years.

他是600年来第一位辞职的教皇。

It will mark his first visit to the US as pontiff.

这将是他首次以教皇的身份访问美国。

But they also take the pontiff to task on lots of things.

但是，他们也向教皇提及了许多其他事情。

The pontiff was speaking to pilgrims at his Summer Palace.

罗马教皇当时正在夏宫对朝拜者讲话。