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本期内容：
This weekend, close to 200 million Americans will face temperatures of 90F (32C) and higher. Add in humidity, and many cities across the East Coast and Midwest will be feeling more like 110F (43C). Heat waves have killed more people on average than any other extreme weather event in the US, according to the Centers for Disease Control (CDC). Officials define extreme heat as a period of two to three days of high heat and humidity with temperatures above 90F (32C).
temperature n. 温度
Fahrenheit n. 华氏温度
Celsiusn. 摄氏温度
humidity n. 湿度
humid adj. 潮湿的
heat wave: 热浪，三伏天
on average: 平均来看
official n. 官员，官方
define … as …: 把……定义为……
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