請問"電梯正在保養中 無法使用"怎麼說？

http://www.thefreedictionary.com/in-service?sr=VRQ2This elevator is not in service due to preventive maintenanceOr "Not in service"- The North American sense of "in service" as "available for use" or "operational" is used especially for telephone numbers and methods of public transportation, such as elevators, buses, or taxis.

電梯正在保養中 = The elevator is under maintenance.電梯無法使用 = The elevator is out of service.Thanks, Jar.