If the character is an operator, pop operators until you reach an opening parenthesis, an operator of lower precedence, or a right associative symbol of equal precedence.
如果字符是个操作符，弹出(pop)操作符，直至遇见开括号(opening parenthesis)、优先级较低的操作符或者同一优先级的右结合符号。
If the character is an operator, pop two operands, perform the appropriate operation, and then push the result onto the stack.
如果字符是个操作符，弹出两个操作数，执行恰当操作，然后把结果压入堆栈。
Depending on the metric and the operator that you select, you are presented with the appropriate field, button or pop-up to help you accurately enter the value.
根据选择的指标和操作符，会出现适当的框、按钮或弹出窗口以帮助准确地输入值。
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