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词汇 upgrade
释义 upgradeupgradeD.J.:[ˌʌpˈɡreid]K.K.:[ˈʌpˌɡred]n.1.向上的斜坡Freight trains travel slowly on upgrades into the hills.火车徐徐向山上驶去。vt.1.提升, 使升级They upgraded the land by improving it with new buildings.他们建造新楼房来提高土地的等级。
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