The reason for this is that during execution, a thread can pop any number of references from its stack — references that could have been stored elsewhere during execution.
这样做的原因在于，执行期间线程可以从其栈中弹出任意数量的引用——执行过程中可能存储在其他位置的引用。
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。
Arrays respond to push and pop, where push adds an item (at its last spot) and pop removes one (like a stack, from the last position).
Arrays支持push和pop操作，其中push增加项目(在其最后一个位置)而pop移除项目(就像堆栈，从最后一个开始)。
When it is an operator, pop two Numbers from the stack, do the calculation, and push back the result.
当它是一个操作符时，从栈中弹出两个数进行运算，并且将运算结果压入栈中。
When it is an operator, pop two Numbers from the stack, do the calculation, and push back the result.
当它是一个操作符时，从栈中弹出两个数进行运算，并且将运算结果压入栈中。
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