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 the length ofa ruler is 20 cm.
测量尺的标准长度是20厘米。
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2. Thecompany's standard operating procedures are well-defined.
公司的标准化操作程序已经明确定义。
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3. The standard deviation measures how spread outthe data points are from the mean.
标准差衡量的是数据点与均值的距离。