[] to make a piece of machinery, computer system, etc. more powerful and efficient; to start to use machinery or systems of this type 使升级◆We've just upgraded to the latest version of the operating system. 我们刚刚升级至最新版操作系统。◆upgraded computers 已升级的计算机
() [] to give sth a higher grade, value or status 提高级别；提升◆The Bank has upgraded its rating on the stock to ‘buy’. 英格兰银行将这支股票的评级上调至“买入”。◆The company's credit rating has been upgraded (= they are now considered to be more likely to pay their debts). 这家公司的信用评级被调高了。SYNpromote
() [] to give sb a more important job; to make a job more important 提拔（某人）◆He's been upgraded to Head of Sales. 他被提拔为销售部主管。SYNpromote
[] to give sb a better seat on a plane, room in a hotel, etc. than the one that they have paid for （飞机、酒店等）升舱，升级◆We were upgraded to business class. 我们被升级到公务舱。
[] to improve the condition of a building, etc. in order to provide a better service （改善建筑物等）改善条件◆The factory has been upgraded to meet current safety standards. 这家工厂已经作出改善以满足当前的安全标准。
▸upgrade /ˈupgreɪd/
noun
[] ◆instructions for installing an upgrade to the existing system 安装现有系统更新的指令◆credit rating upgrades 信用评级提高◆Frequent flyers qualify for a free upgrade. 常旅客有资格享受免费升舱。▸upgrading /ˌʌpˈgreɪdɪŋ/
noun
[, ]◆the upgrading of the firm's PCs 这家企业个人电脑的升级➡downgrade