security ID安全标识符securityn.安全；保证；证券；债券；抵押；防护措施security threat对安全的威胁security affair安全事务security treaty安全条约Security tunnel安全隧道security broker证券经纪人security detail安保小分队，安保特遣队security ststem安全性系统security office保安办公室security rating[经] 证券等级评定Security at sea海上保安