The concretespecification and compositions of targets can be made according to the concrete request of the customers.
靶材的具体规格和成分可根据用户的具体要求定做。
2
Along with the case studies and examples he identifies common challenges and issues that can face teams brining in Specification by example and offers concrete advice on how to tackle them.
Such statements suggest "service" is more concrete, that is, a specification of something, but still not something with which a requester can interact.