每日一詞 1010 Upgrade：升級
今天我們要學的詞是upgrade。 Upgrade, 升級。 "The local elementary school received a library upgrade thanks to donations from the alumni association," 校友會的慷慨捐贈，讓本地小學圖書館煥然一新。
美國副總統(tǒng)官邸準備加強安全裝置。 "The Vice President's official residence is getting a $1.7 million security upgrade," 副總統(tǒng)官邸要進行耗資170萬美元的保安系統(tǒng)升級。市場調查顯示， "Many customers are putting off plans to upgrade their cell phones during the economic downturn," 經濟不景氣，使很多顧客推遲手機升級的計劃。好的，今天我們學習的詞upgrade...
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