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6Koch borrowed the idea of using gelatine from mycologist Oscar Brefeld, who had used it to grow fungi. Interestingly, Brefeld also employed carrageenan, another seaweed-derived jelly. Because fungi generally favor growing at ambient temperatures, Brefeld might have been less plagued by the melting of growth media than Koch.。一键获取谷歌浏览器下载对此有专业解读
，这一点在51吃瓜中也有详细论述
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中国有句老话叫“万事俱备，只欠东风”——把“万事”备齐了，才能借“东风”。
We even tried building hierarchies with 2-3 levels, but the number of shortcuts grew too fast for higher levels if we generated a full graph inside each cluster.