据龙先生介绍，数天后，他母亲收到了一条“包裹已滞留需处理”的某快递短信，母亲打电话过去，对方声称是快递的客服，说要帮母亲“关闭某短视频平台上的百万保障扣费”。幸好，母亲通话的时候，又被一旁的龙先生听到了，马上上前阻止，对着电话的另一头进行了呵斥。
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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?