Pop the stack and draw a green rectangle to remove the previous translation and scaling.
从堆栈中取出坐标，绘制一个绿色矩形，以便删除之前的转换和缩放。
Those variables pop off the stack when their containing function is complete.
当其所包含的函数完成后，这些变量将从堆栈中弹出。
At the end of the postfix expression, pop a result from the stack.
到后缀表达式末尾，从堆栈中弹出结果。
At the end of the postfix expression, pop a result from the stack.
到后缀表达式末尾，从堆栈中弹出结果。
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