Structure design simple, the operation and the maintenance is easy.
构造设计简单，操作及维护容易。
This simple design, possible because the data obeys strict LIFO order, means that no complex data structure is needed to track stack contents - a simple pointer to the top of the stack will do.
这种简单的设计，很有可能是考虑到数据操作都符合后进先出（LIFO ）规则，这意味着访问栈的内容并不需要复杂的数据结构，一个简单的栈顶指针就能搞定一切。
The design has a simple structure, a low cost, and a strong safety and operability .
该设计结构简单，造价成本低，具有较强的安全性和可作性。
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