Work-life balance
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.
，这一点在谷歌浏览器【最新下载地址】中也有详细论述
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核燃料循环体系包括铀（钍）矿勘查、开采冶炼、纯化转化、同位素分离、燃料元件制造、乏燃料后处理等环节。
China urges citizens in Iran to evacuate