慢速英语:China Battles Worst Air Pollution of the Year

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短语讲解：

1. Driving restrictions were also put in effect and hundreds of flights were delayed or cancelled in Beijing because of poor visibility.

because of 因为，由于
例句：It is mainly because of my fault.
这主要是由于我的过错。

2. In the long run, the pollution problem can only be eased by adjusting the country’s industrial structure, or accelerating the upgrading of [polluting] industries, so as to cut down the emission sources of pollutants,” Ma said.

cut down 减少; 裁短
例句：He was ordered to cut down his daily consumption of food.
他遵嘱减少自己每天摄入的食物量。