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。
Associative compounds is a character system in which a couple of pictographs combines together to create a new meaning.
会意文字是通过几个象形文字的制约并呈现出另一个意思的文字体系。
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