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This is Scientific American's 60-Second Science, I'm Cynthia Graber. This'll just take a minute. When Harry Potter slips underneath his invisibility cloak, he can wander freely undetected, but what about a cloak of silence, one that completely deaden
发表于:2019-01-08 / 阅读(66) / 评论(0)
Scientific American(六)月
Scientific American(六)月