As we head into the hot temperatures in the summer months, Americans will increasingly turn to air conditioning to keep ourselves cool. But during the COVID-19 pandemic, is air conditioning safe, or does it increase the spread of the coronavirus?
An early release research letter in the journal Emerging Infectious Diseases, published by the CDC, adds some evidence - and confusion - to the debate.Researchers studied an outbreak of COVID-19 in an air-conditioned restaurant in China in which an asymptomatic diner infected nine other people from three families dining at the same time.They concluded the direction of flow from the restaurant’s air-conditioning was consistent with viral droplet transmission. They argued restaurants should prevent transmission by increasing the distance between tables and improving indoor ventilation.Before we get carried away about our home AC, here are some points to consider.First, even if the restaurant is where those nine people caught the virus, there were 73 other people who dined in the restaurant that day. None developed COVID-19. If anything, this study shows the value of social distancing. The restaurant’s customers were packed in tightly. Since the largest risk for COVID-19 continues to be close contact with other people, it's still important to stay six feet away other people.Plus, maybe we should limit our time in crowded places. The affected people in that Chinese restaurant were there for up to 73 minutes.Until we get more data proving air conditioning plays a causative role in COVID-19 outbreaks, and as long as you're not hosting big parties in your home, you should be able to safely run your air conditioner normally.
1. 全文逻辑
一：介绍-引出话题
二：当前观点
三：个人观点-观点1-观点2
四：结论
2. 词汇
①Droplet transmission: 飞沫传播
Some diseases can be transferred by infected droplets contacting surfaces of the eye, nose, or mouth. This is referred to as droplet contact transmission
②get-carried-away：过于…..
在这段音频的语境下，可以理解为“过于谨慎” take something too far
3. 背景补充
①为什么会把空调和疾病传播联系起来？
新型冠状病毒肺炎的主要传播途径为飞沫传播、接触传播和粪口传播 (faecal-oral transmission)。飞 沫通过咳嗽、打喷嚏，在空气当中的传播距离有限，一般是一米或者两米，它从人体出来后很快沉降，不会在空气中漂浮。在空调工作状态下飞沫活动范围会明显增大。
带有全区域回风系统(return plenum)（整体室内空气的循环利用）的中央空调，交叉感染的风险较大。这类空调常用于商场、机场、候车厅、工厂厂房以及医院门急诊大厅等空间较大的场所。由于这些空间人数较多，健康者与患者混杂.
局部回风和没有回风的其他空调，不会造成大面积交叉感染,如家用分体式空调,因为空气只在一个屋内循环。
②Airborne transmission: 空气传播
Airborne transmission refers to situations where droplet nuclei (residue from evaporated droplets) or dust particles containing microorganisms can remain suspended in air for long periods of time. These organisms must be capable of surviving for long periods of time outside the body.
4. 提示：
①这段音频中有许多提示词
②最开始两个问句代表了讲话的主题
③ Before we get carried away about……, here are some points to consider,表明讲者要在这里进行转折，阐述与上文不一样的内容
④ “firstly”, “plus”代表讲者要阐述几个不同的观点，而且是并列关系
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