单词	留有后备
释义	留有后备 keep sth in reserve后备
随便看	operational diagnostics operational diagram operational differential amplifier operational differential subsidy operational difficulties operational difficulty ties operational difflculties Operational Digital Network operational digital technique operational dilemrna operational dimension operational dimension calculation by computer Operational Direction and Management Control operational discharge operational diskette Operational Display Information Network operational display system operational disposition operational distribution panel operational diversification operational diversion operational doctrine operational doctrine of foreign armies operational document Operational Documentation