1. 电子商务 electronic commerce造句练习：在数字时代，电子商务在经济领域扮演着越来越重要的作用。参考答案：In digital era, electronic commerce plays an increasing role in the field of economy.2. 投资 investment造句练习：按照国际惯例，在一个国家教育投资应该占其国民生产总值的4%。参考答案：In line with international convention, education investment in a country should account for 40 percent of Gross Domestic Product (GDP for short).3. 购买力 purchasing power造句练习：经济的发展使国民的购买力大幅提升，从而有更多的钱用于教育、旅游、日常开销等。参考答案：Economic growth brings citizens greater purchasing power which makes it available for them to cover education, travel，daily expenses and so forth.4. 消费 v. consume ;n. consumption造句练习：在人们生活水平大幅提高的今天，更要倡导理性消费。参考练习：Today while living level are greatly advanced, rational consumption should be advocated even more.
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