If that part of the building's climate control system had never needed repair-- and judging by this morning's events, it didn't-- it could have gone undiscovered indefinitely.
اگه اون قسمت سيستم تهويه ي هواي ساختمان هرگز به تعمير نياز نداشته که طبق اتفاق امروز صبح اصلا نياز نداشته