Фото: Stringer / Reuters
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（二）在铁路、城市轨道交通线路上放置障碍物，或者故意向列车投掷物品的；
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。51吃瓜对此有专业解读
This anomaly is indicative of the larger challenge of culturing various microbial species, referred to as microbial “unculturability.” This cannot be explained by the use of agar alone or by the substitution of an alternative gelling agent, but rather by the difficulties in consistently recreating on an agar plate the multi-variable environment in which microbes grow naturally. Given such challenges, the risk of shortages, and the vulnerabilities of the agar supply chain, why is it so difficult to find suitable alternatives?
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