The last token read (closing parenthesis) is not the cause of the error.
最后一次符号读取(结束括号)并不是这个错误的根源。
Expressions must not begin with an operator, comma, or closing parenthesis.
不可以用操作符、逗号或闭括号作为表达式的开始符。
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(closing parenthesis)，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。
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