服务只有被消费了才有用；所以，要规定服务的效用，最好的方式就是描述消费者对它们有何期望。

Services are useful only insofar as they are consumed, and so the best way of specifying their usefulness is to describe what consumers expect of them.

youdao

服务只有被消费了才有用；所以，要规定服务的效用，最好的方式就是描述消费者对它们有何期望。

Services are useful only insofar as they are consumed, and so the best way of specifying their usefulness is to describe what consumers expect of them.

youdao