If the character is an operand, push it onto the stack.

如果字符是一个操作数，把它压入堆栈。

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If the character is an opening parenthesis, push it onto the stack.

如果字符是个开括号，把它压入堆栈。

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Push the operator onto the stack.

把这个操作符压入(push)堆栈。

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PUSH processor registers onto the current task's stack;

所有处理器寄存器的值推入当前任务栈；

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PUSH processor registers onto the current task's stack;

所有处理器寄存器的值推入当前任务栈；

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