The hospital's electronic records are part of their MCS and must operate 24/7.

MCS 是 "Mission Critical System" 的缩写，意思是"关键任务系统"，指那些对组织运作至关重要的系统，一旦出现故障会导致严重后果。这类系统通常需要高可靠性和不间断运行。