单词：Both respirators
[网络] 两种呼吸器
单词：Both respirators 相关文章
N95 respirators are designed to protect you from breathing in very small particles that may contain viruses. These types of respirators fit tightly to the face so that air is inhaled through the filter material. N95 respirators should be worn only on
发表于:2018-12-11 / 阅读(283) / 评论(0)
英语解说豆知识2009年
英语解说豆知识2009年
When smog descends on Beijing or other Asian cities, people rush to buy face masks. 当雾霾降临到北京等亚洲城市的上空时，人们争相购买口罩。 But how effective are the masks at filtering out tiny, harmful particles of pollutio
发表于:2019-02-07 / 阅读(76) / 评论(0)
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