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今天我们要学的词是upgrade. Upgrade做为动词，有升级的意思。A monitoring group says satellite imagery has shown that North Korea is making rapid upgrades to a nuclear research facility. 一个监督组织说，卫星图片显示，朝鲜正在对朝鲜的一个核研究设施进行快速改善升级。Royal Caribbean Cruise Line invested $120 million to upgrade a 15-year-old ship in an effort to attract younger consumers. 皇家加勒比海游轮投资1.2亿美元，对一艘15年的游轮升级改造，力图吸引更年轻的消费者。好的，我们今天学习的词是 upgrade, upgrade, upgrade ...
