请注意所有的决策变量都是0或1，这与我们期望的一样。

Note that all the decision variables are either 0 or 1, as expected.

youdao

字符串变量的长度：substr函数的输入参数，决定了结果字符串的期望长度或length函数的输出。

Length of a string variable: Input argument for the SUBSTR function, which determines the desired length of the resulting string or output of the length function.

youdao

如前所述，这个变量支持设置awk期望在字段中找到的字符序列。

As mentioned earlier, this variable allows you to set the character sequence that awk expects to find between fields.

youdao

The basic definition-- the expected value of some random variable x--E--I guess I should have said that a random variable is a quantity that takes on value.

最基本的定义,某一个随机变量X的期望值E,我应该提到过,随机变量是一个可以取值的数

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