inthebuilding的意思及用法?
TheParthenonwasachurchfrom1204until1456,whenAthenswastakenbyGeneralMohammedtheConqueror,theTurkishsultan,whoestablishedamosqueinthebuildingandusedtheAcropolisasafortress.
麻烦翻译一下这句话,inthebuilding在这句话里是什么意思,为什么要这么用?