in the building的意思及用法?

题目

in the building的意思及用法?
The Parthenon was a church from 1204 until 1456,when Athens was taken by General Mohammed the Conqueror,the Turkish sultan,who established a mosque in the building and used the Acropolis as a fortress.
麻烦翻译一下这句话,in the building在这句话里是什么意思,为什么要这么用?

答案

帕底农神庙是1204年到1456年间的一座教堂,穆罕默德将军征服了雅典后,这位土耳其的首领在其中建了一个清真寺,并将雅典卫城作为一座堡垒.
the building 指的是 The Parthenon