Service Temporarily Unavailable 是什么意思The server is temporarily unable to service your request due to maintena？

前一句的意思是“暂时无法供给办事”。后一句是“因为系统维护中，暂时无法供给办事。”

Service Temporarily Unavailable：办事暂时不成用

The server is temporarily unable to service your request due to maintenan：因为维护办事器暂时无法为您的恳求办事