air defense backup防空: air defense; antiaircraft; a ...保障: ensure; guarantee; safeguard靶机防空保障舰: antiaircraft target service ship太空保障系统: space operation service functions防空雷达保障: radar defense下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:防空保障，即可在微信中查询翻译
