I used pop instead of shift at the end because of the order of evaluation.
在结尾使用pop而不是shift，是因为计算的顺序。
Often, the order of operand evaluation has no impact on the result of the expression.
通常，操作数的求值顺序不会影响表达式的结果。
The principle and method of preferential order evaluation was described.
介绍了优序评价的原理和方法。
The principle and method of preferential order evaluation was described.
介绍了优序评价的原理和方法。
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