经过多年发展和积累，我国在提升全要素生产率方面已拥有诸多有利条件和基础：
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.
，这一点在快连下载安装中也有详细论述
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