本期内容：

China declared a smog emergency in 24 north-eastern cities, shutting schools, curbing road traffic and urging people to stay indoors. More than 300 flights were cancelled or rerouted at Beijing Capital Airport, after the fourth day of heavy smog. The authorities blame rule breaches and unusually bad weather; air pollution is becoming a burning political issue.

Smog: 雾霾
Curb: 限制
Reroute：改道
Breach：违反
Burning issue：当务之急

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