趣英语 / upgrading是什么意思？

upgrading是什么意思？

n.
浓缩

v.
提升( upgrade的现在分词 )，使（机器、计算机系统等）升级，提高（设施、服务等的）档次，提高（飞机乘客、旅馆住客等）的待遇

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