慢速英语:Businesses Close in U.S. to Mark 'Day Without Immigrants'

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1. immigrant n.移民，侨民
例句：North Africans make up the largest and poorest immigrant group in the country
北非人构成了该国最大的、也是最贫困的移民群。

2. promise vt.允诺，许诺
例句：The post office has promised to resume first class mail delivery to the area on Friday
邮局承诺于星期五恢复对这个地区第一类邮件的递送。

3. evolve vt.使发展; 使进化; 设计
例句：Our understanding continues to evolve on how students acquire languages.
我们还在继续探讨学生到底如何学习语言。

4. realize vt.实现; 了解，意识到
例句：Do you realize it's Saturday?
你知道今天是星期六吗?
 
5. protest n.抗议; 反对; 申明
例句：Groups of women took to the streets to protest against the arrests
成群结队的妇女上街抗议逮捕行动。

6. immigrate vi.移入
例句：He immigrated from Ulster in 1848
他1848年从阿尔斯特移民到这里。