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Before agar, microbiologists had experimented with other foodstuffs as microbial media. They turned to substances rich in the starches, proteins, sugars, fats, and minerals that organisms need for growth, testing with broths, bread, potatoes, polenta, egg whites, coagulated blood serums, and gelatine. However, none worked particularly well: all were easily broken down by heat and microbial enzymes, and their surface, once colonized, became mushy and unsuitable for isolating microbes.，详情可参考Line官方版本下载
A04-05·北京SourcePh" style="display:none"。爱思助手下载最新版本是该领域的重要参考
await dropNew.writer.write(chunk3); // silently dropped，这一点在服务器推荐中也有详细论述