1. A statistical measure of the variance of two random variables that are observed or measured in the same mean time period. This measure is equal to the product of the deviations of corresponding values of the two variables for their respective means. 
   协方差在观察或测量同一平均时间的两个任意变量的变化的一个统计值。这个值等于这两变量的各自平均值偏离其相应值的乘积
2. Not observed or noticed. 
   未被注意的没有被观察到的或没有被注意到的
3. critical line of measure 
   度量关节线
4. I observed him going out. 
   我看见他出去了。
5. No one observed on that. 
   没有人对那件事发表意见。

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• 1. 观察测定数
  numerical measure 数量...observed measure 观察测定数...occupational interest measure 职业趣向测量
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