单词：expected value
[化] 期望值; 期待值; 统计平均值
expected value的用法和样例：
例句
- The expected value itself very rarely can help us.期望值本身很难帮助我们。
- The term expectation value is often used instead of average value.期望值这个名称常用来代替平均值。
- first moment一次矩
- arithmetic mean算术平均值
- expectation预料
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