In one experiment, nearly 200 participants boarded a double-decker bus for a tour of Philadelphia.
在一项实验中,近200名参与者登上一辆双层巴士游览费城。
However, since droplets from a sneeze can travel the length of a double-decker bus, and a cough can infect anyone within about a metre, this is not always possible.
然而,从一个喷嚏而来的液滴能漫游一双层巴士的长度,并且咳嗽能感染一公尺以内的任何人,但这未必永远如此。
It wouldn't even be a double-decker bus. It would be a simple briefcase.
那也不会是一辆双层巴士,而仅仅是个的行李箱公文包。
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