“年龄越来越大，再等下去很困难。”刘成对南方周末记者说。他们找到国内一家代孕机构，对方承诺孩子出生后能顺利领到出生医学证明。
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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?
特点：与 GELU 类似，是一种平滑版 ReLU。
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