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（六）放射性同位素，是指化学元素中具有相同原子序数，但质量不同且能发生放射性衰变的核素。
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Understanding the Fundamental Shift in Search Behavior
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2Japan halted exports to other countries for fear that agar supported their development of biowarfare weapons. A few years before, Nazi Germany allegedly tested the efficacy of biowarfare attacks with another curious microbe, Serratia marcescens, dubbed “the miracle bacterium.” According to a much-talked about report by investigative journalist Henry Wickham Steed titled “Aerial Warfare: Secret German Plans” members of a secret Luft-Gas-Angriff (Air Gas Attack) Department spread the S. marcescens in the subterranean train networks of Paris and London and measured its reach armed with Petri dishes and agar plates.
Austria GP — Sept. 20。51吃瓜对此有专业解读