飞沫传播

Transmission

9) The number of violent acts on televisions in the past years __ has increased __ (increase) from about 19 to 27 per hour. (15A 2004 上 ) 10) Your mind _ will keep ___ (keep) up with your reading sp

发表于:2018-12-01 / 阅读(126) / 评论(0)

自考英语（一）78讲

英伦广角打喷嚏形成的气流移动速度飞快

Sneeze and cough particles form a cloud whose turbulence pulls in surrounding air, which allows the goop to maintain buoyancy and move farther than expected. Cynthia Graber reports. Gordon: When you have to sneeze or cough, do it into the bend of you

发表于:2019-01-02 / 阅读(83) / 评论(0)

英伦广角

SSS 2008-02-04

This is Scientific Americans' 60-Second Science. I'm Chelsea Wald. Got a minute? Vinaigrette dressing: when you shake it little vinegar droplets scatter through the oil, but when you put it down, the droplets merge and the dressing separates. That's

发表于:2019-01-08 / 阅读(54) / 评论(0)

Scientific American(二)月

VOA慢速英语 2007 1003a

This is the VOA Special English Health Report. Scientists continue to look for ways to deal with the deadly form of bird flu virus. Medical workers care for a bird flu patient in Medan, Indonesia, last year Researchers in Singapore, for example, hav

发表于:2019-01-11 / 阅读(48) / 评论(0)

VOA慢速英语2007年（十）月

一次咳嗽会产生2万个病毒

一次咳嗽会产生2万个病毒 The next time you cough or sneeze, there is good reason to cover your mouth. As many as 20,000 viruses are expelled in an average cough, which may be sufficient to infect many people - particularly those who are not

发表于:2019-02-05 / 阅读(42) / 评论(0)

实用英语

经济学人236:金属,自己愈合吧 Metal,heal thyself

Metal, heal thyself 金属，自己愈合吧 Materials science: Researchers have devised an ingenious way for the damaged surfaces of metals to repair themselves when they come to harm 材料科学：研究人员构想出了一种新颖独特的方法，

发表于:2019-02-17 / 阅读(55) / 评论(0)

经济学人综合

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