相关单词近义词 vulnerability 易受攻击, helplessness 无可奈何, powerlessness 无力, weakness 软弱, frailty 脆弱, defencelessness 无防御, unprotectedness 无保护临近词defense pact, defense, Defense Communication Satellite System, Defense Second Communication Satellite, Defense Communications Agency Circular, Defense Production Sharing Arrangement, Defense Finance and Accounting Service, Defense Air Transportation Association, Defense Industry Advisory Group Europe, Defense Contract Administration Service, Defense Acquisition Improvement Program, Defense Nuclear Facilities Safety Board 返回 defenselessness