全球每年钪产量仅为几十吨，但它在燃料电池、特种铝合金以及先进芯片工艺和封装环节中承担关键角色。
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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.。heLLoword翻译官方下载对此有专业解读
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