available with a take-up roller that stored the printed output under a locked
圖像來源，BBC CHINESE/ TING CHIANG
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我跳下炕头，跑出大门，14头牛犊已经不见踪影，只剩空中扬起的一溜尘土。自去年我帮老爸挡过一次跑出圈的牛群，再遇到这种事我已经不慌了，抄起一根木棍到牛棚旁的岔路口“站岗”，等着引导奔腾而来的牛群入圈。
Фото: Bernadett Szabo / Reuters
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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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