Allow emoticons: Translate character groupings such as: - into the appropriate image of a smiley face.
支持表情字符:将:-这样的字符组合翻译成适当的笑脸图像。
If the character is an operator, pop two operands, perform the appropriate operation, and then push the result onto the stack.
如果字符是个操作符,弹出两个操作数,执行恰当操作,然后把结果压入堆栈。
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