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1·Write a right parenthesis.

写入右括号。

2·Every left parenthesis in a string is matched by a right parenthesis.

字符串的左括号都有相应的右括号。

3·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。