During each iteration we work on the highest priority requirements which are still left to be implemented, effectively working our way down the requirements stack.

在每个迭代过程中，我们处理那些仍旧需要实现的最高优先级需求，有效地减少需求堆栈。

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Creating and logging the exception incurs some overhead, but the stack trace is invaluable for tracking down who caused the problem.

创建并记录异常日志会导致一些时间开销，但是堆栈跟踪可以很好地用于捕获问题原因。

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You can go up and down the stack using the toolbar or the GUD buffer. The source buffer updates accordingly, as does the locals buffer.

你可以使用工具栏或GUD buffer在栈上上下来回，源代码buffer和locals buffer也会相应更新。

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By moving security down the stack, Intel and McAfee can likely make devices safer.

FORBES: What Does Mobile 'Security On A Chip' Mean Anyway?

Many, many experiments up and down the stack are quite exciting when we are able to remove the variable of gravity.

WHITEHOUSE: President Obama's call to the International Space Station

Finally, the red category is reserved for iPhones that provide little function beyond holding down a stack of papers or propping open your door.

ENGADGET: Sprint to offer three levels of iPhone service, 'yellow' AppleCare+ repairs will cost $49