It makes life easier for device manufacturers because it provides a starting point - a known working implementation of the stack that can be adapted to various devices.

它的出现使设备制造商变得更轻松，因为它提供了一个起始点—可以在多种设备中使用的堆栈的知名工作实现。

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A change within any layer of a service implementation stack could cause a regression in the service capabilities.

任意服务实现堆栈层中的变更都可能导致服务功能的回归。

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Often, as work items such as requirements come off the stack for implementation in the current iteration, an equal or greater number of work items are added back to the stack.

通常，随着需求条目从本次迭代中的执行栈中移除，相等数量的或者更大数量的工作条目就会被添加回这个栈中。

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