习近平指出，中国和德国分别是世界第二、第三大经济体，中德关系不仅关乎两国利益，也对欧洲和世界有重要辐射效应。当前国际形势正在经历第二次世界大战结束以来最深刻演变。世界越是变乱交织，中德两国越要加强战略沟通、增进战略互信，推动中德全方位战略伙伴关系不断得到新发展。
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.，详情可参考搜狗输入法2026
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