CCTV9英语新闻12月：空气过滤器 口罩销售

Spikes¹ in air pollution around the country have caused parallel spikes in sales of air filters and face masks. On Taobao and Tmall, China's online shopping websites, nationwide sales of face masks over the last seven days are 9 times higher than they were during the same week last year.

Similarly, sales of air purifiers also jumped on Taobao. Almost three times as many were sold this week as were sold during the same period last year.

This month, smog has enveloped² more than 100 large and medium-sized cities in 25 provinces. PM2.5 levels were more than 24 times higher than the World Health Organisation’s guidelines in some areas of the Yangtze River Delta³. 

1 spikes   

n.穗( spike的名词复数 )；跑鞋；（防滑）鞋钉；尖状物v.加烈酒于( spike的第三人称单数 )；偷偷地给某人的饮料加入（更多）酒精（ 或药物）；把尖状物钉入；打乱某人的计划

参考例句：

• a row of iron spikes on a wall 墙头的一排尖铁
• There is a row of spikes on top of the prison wall to prevent the prisoners escaping. 监狱墙头装有一排尖钉，以防犯人逃跑。 来自《简明英汉词典》

2 enveloped   

v.包围，笼罩，包住( envelop的过去式和过去分词 )

参考例句：

• She was enveloped in a huge white towel. 她裹在一条白色大毛巾里。
• Smoke from the burning house enveloped the whole street. 燃烧着的房子冒出的浓烟笼罩了整条街。 来自《简明英汉词典》

3 delta   

n.（流的）角洲

参考例句：

• He has been to the delta of the Nile.他曾去过尼罗河三角洲。
• The Nile divides at its mouth and forms a delta.尼罗河在河口分岔，形成了一个三角洲。