系统结合符号演算系统，在生成试题的同时，能自动给出相应的答案。
By using symbol operation for this model, this model can give answers while building test papers.
从这项研究中明显可以看出，结合符号，图形和建筑，综合设计概念方面占比较大。
It was clear from the study that a great deal of weight is placed on integrated design concepts that combine signs, graphics and architecture.
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 operators until you reach an opening parenthesis, an operator of lower precedence, or a right associative symbol of equal precedence.
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