解释：[I,T] to make a computer, machine, or piece of software better and able to do more things 使〔计算机、机器、软件〕升级。
例如：The hotel has recently been refurbished and upgraded.这家酒店最近重新装修。
n. 向上的斜坡;vt. 提升; 使（机器、计算机系统等）升级; 提高（设施、服务等的）档次; 提高（飞机乘客、旅馆住客等）的待遇;[例句]Helicopters have been upgraded and modernized 直升机已经更新换代，装配了现代。
强调升级美国主要机场的必要性。
Have to be upgraded when new technologies come.当新技术出现时，必须升级。
[例句]Helicopters have been upgraded and modernized 直升机已经更新换代，装配了现代化设备。
[其他] 第三人称单数：upgrades 现在分词：upgrading
n. 向上的斜坡;vt. 提升; 使（机器、计算机系统等）升级; 提高（设施、服务等的）档次; 提高（飞机乘客、旅馆住客等）的待遇;[例句]Helicopters have been upgraded and modernized 直升机已经更新换代，装配了现代。