我们基于自愿的原则，开展上门送餐的服务。

We run the meals-on-wheels service on a voluntary basis.

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最后，我们将说明适用于各个服务操作的设计原则。

Finally, we state the design principles that apply to individual service operations.

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接下来，我们将讨论适用于整个服务（而不是各个操作）规范的设计原则。

Next, we consider the design principles that apply to the specification of services as a whole rather than to individual operations.

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