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（单词翻译）
本期内容：
China declared a smog emergency in 24 north-eastern cities, shutting schools, curbing road trafficand urging people to stay indoors. More than 300flights were cancelled or rerouted at Beijing CapitalAirport, after the fourth day of heavy smog. Theauthorities blame rule breaches and unusually badweather; air pollution is becoming a burning politicalissue.
Smog: 雾霾
Curb: 限制
Reroute：改道
Breach：违反
Burning issue：当务之急
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