考研英语的战场上，词汇是决定胜负的基石。掌握科学的记忆法和真题语境，才能把单词真正刻在脑子里。今天，我们就来拆解一个考研高频核心词——expansion，看看它到底有哪些隐藏的考点?

高频考研英语单词：expansion

单词：expansion

音标：/ɪkˈspænʃn/

释义：n.扩张；膨胀；张开；伸展

考频：★★★★★

记法：

拆解为前缀ex-(向外) + 词根pand(=spread，展开) + 名词后缀-sion → 向外不断展开的动作/状态 → 扩张、膨胀。可结合考研阅读高频考点economic expansion（经济扩张）联动记忆，同时关联同根动词expand加深记忆印象。

派生词：

expand (动词原形，意为“扩张，使膨胀，详述，展开”)

expansive (形容词，意为“广阔的，扩张性的，开朗健谈的”)

expansible (形容词，意为“可扩张的，可膨胀的”)

expansionism (名词，意为“扩张主义，扩张政策”)

搭配：

economic expansion 经济扩张

market expansion 市场扩张

territorial expansion 领土扩张

expansion of demand 需求扩张

expansion phase 扩张阶段

考研真题例句：

The Supreme Court has ruled that states can require companies to collect sales tax on online purchases, ending a decades-long effort by retail groups to push for the expansion of tax rules to cover e-commerce.

最高法院裁定各州可以要求企业对线上购买行为征收销售税，终结了零售集团数十年来推动税收规则扩展覆盖电子商务的努力。

The US Postal Service has been struggling with huge financial losses for years, largely due to the expansion of digital communication that has reduced demand for traditional mail services.

美国邮政署多年来一直深陷巨额亏损，很大程度上是由于数字通信的扩张降低了传统邮政服务的需求。

According to the World Bank, the expansion of the IT industry in developing countries could lift billions of people out of poverty in the next two decades.

根据世界银行的说法，未来二十年发展中国家信息技术产业的扩张可以让数十亿人摆脱贫困。

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