慢速英语:波多黎各宣布紧急状态，地震后启用国民警卫队

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magnitude – n. : the size, extent, or importance of something

hurricane – n. an extremely large, powerful, and destructive storm

infrastructure – n. the basic equipment and structures (such as roads and bridges) that are needed for a country, region, or organization to function properly

aftershock – n. a smaller earthquake that occurs after a larger one

implement – v. to put in place