名词
中文翻译：标准
同义词：
['norm', 'normative', 'standardized']
例句：
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1. The standard for measuring thelength of a ruler is 20cm.
测量尺子长度的标准是20厘米。
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2. The company has adopted a newstandard for its products.
该公司已经采用了新的产品标准。
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3. The standard deviation is used tomeasure the amount of variation in a dataset.
标准差用于衡量数据集中的变异量。