If the character is an opening parenthesis, push it onto the stack.
如果字符是个开括号，把它压入堆栈。
Expressions must not end with an operator, function, comma, or opening parenthesis.
不可以用操作符、函数、逗号或开括号作为表达式结束符。
If the character is a closing parenthesis, pop all operators until you reach an opening parenthesis and append them to the result string.
如果字符是个闭括号(closingparenthesis)，在遇见开括号前，弹出所有操作符，然后把它们添加到结果字符串。
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。
Cause: you did not have correct opening and closing of parenthesis in your search filter.
原因：您没有正确的开启和关闭括号在您的搜索过滤器。
Cause: you did not have correct opening and closing of parenthesis in your search filter.
原因：您没有正确的开启和关闭括号在您的搜索过滤器。
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