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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Safew下载中也有详细论述
利润大幅增长主要来自「其他收入」的显著提升。
2.1 先检查环境，别装错版本