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。
2
A change within any layer of a service implementationstack 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。
3
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.