近几日北京持续被浓重雾霾笼罩，市场上防尘口罩和空气净化器的销量剧增。
Thee market for dust masks and air purifiers is booming in Beijing because the capital has been shrouded for several days in thick fog and haze.
近几日北京持续被浓重雾霾笼罩，市场上防尘口罩和空气净化器的销量剧增。
Thee market for dust masks and air purifiers is booming in Beijing because the capital has been shrouded for several days in thick fog and haze.
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