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今天我们要学的词是upgrade. Upgrade 作为名词，是更新的意思。The Nigerian Customs Service said it requires about N20 billion to do a system upgrade at the nation’s international airports. 尼日利亚海关说，他们需要200亿奈拉才能完成尼日利亚各大国际机场的系统更新。Leading Silicon Valley companies including Facebook and Google are investing in encryption upgrades. 包括脸书和谷歌在内的硅谷大科技公司都在投资更新自己的加密技术。好的，我们今天学习的词是 upgrade, upgrade, upgrade...
