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词汇 upgrade
释义
upgradeup·grade /ˈʌpɡreɪd ; ˌʌpˈɡreɪd /

verb

[transitive]
to change something so that it is of a higher standard使升级;改善;改进
up·grade /ˈʌpɡreɪd /

noun

[countable] an upgrade of the computer system计算机系统升级
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