extension /ɪkˈstenʃn/ n. 扩大；延伸:

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例句/词组:

the extension of new technology into developing countries 新技术向发展中国家的传播

英语解释：

~ (of sth) the act of increasing the area of activity, group of people, etc. that is affected by sth• 扩大；延伸: