from urllib.parse import urljoin, urlparse
It is difficult to know exactly when the shift from gelatine to agar occurred. As often happens for scientific breakthroughs, agar was likely adopted incrementally alongside the use of other growth media. In 1913, for example, the first diagnosis of Serratia marcescens as a human pathogen was made by growing it on agar as well as on potatoes.，这一点在快连下载-Letsvpn下载中也有详细论述
// Shell原始步长序列: n/2, n/4, ..., 1。关于这个话题，51吃瓜提供了深入分析
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