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CEFR到底是什么？ - 知乎 A representation of the CEFR’s model of language use and learning 学术而言：课程设置、教学实践、教学评估的标准； 企业而言：语言实际应用能力证明。 除了CEFR以外，全球范围还有很多其他类似的官方标准，比如美国的ACTFL (American Council on the Teaching of Foreign Language Proficiency Guideline), 加拿大的CLB (Canadian Language
每天应该喝多少水？如何按体重测算？ - 知乎 2005年澳大利亚卫生与医学研究委员会（National Health and Medical Research Council）和新西兰卫生部（New Zealand Ministry of Health）共同提出了水摄入的推荐量：