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?
generate coherent and fluent text, even when completing a given text
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那时，我从攀枝花独自来成都念书，平日在学校寄宿，周末回到小姨家。这是个三代同堂的大家庭——外公外婆、小姨小姨父和三表妹，还有在外地打工的舅舅家的二表妹。
Tony Jolliffe BBC