单词：Both respirator
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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(269) / 评论(0)
英语解说豆知识2009年
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1. As Pakistani anger mounts, intelligence officials say al-Qaida's No. 2 man was invited to dinner at the village hit by a purported CIA airstrike but didn't show up. 2. A suicide car bomb hits a Can
发表于:2019-01-08 / 阅读(132) / 评论(0)
美联社新闻一分钟2006
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