They generally keep track of pointer movements and changes in input focus and adjust the enlarged view accordingly.
它们通常不断跟踪指针的移动和输入焦点的改变，然后相应地调整放大的窗口。
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 stack is coordinated with a stack pointer that keeps track of storage and retrieval of each byte or word of information in the stack.
栈和一个栈指针配合工作，栈指针随时指示要存取的每个字或字节信息在栈中的位置。
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.
这个简单的设计，可能是因为数据遵循严格的后进先出顺序，这意味着没有复杂的数据结构需要跟踪堆栈的内容-一个简单的指针的堆栈的顶部就可以了。
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.
这个简单的设计，可能是因为数据遵循严格的后进先出顺序，这意味着没有复杂的数据结构需要跟踪堆栈的内容-一个简单的指针的堆栈的顶部就可以了。
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