instruction:
In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
question:
A National Historic Landmark District ( NHLD ) is a historic district that is recognized as an NHL .
answer:
A National Historic Landmark ( NHL ) is a building , district , object , site , or structure that is officially recognized by the United States government for its outstanding historical significance .


question:
Protests and rallies also happen at the National Mall .
answer:
The National Mall 's status as a wide , open expanse at the heart of the capital makes it an attractive site for protests and rallies of all types .


question:
A client-server application is a distributed system made up of both client and server software .
answer:

Client – server model is a distributed application structure that partitions tasks or workloads between the providers of a resource or service , called servers , and service requesters , called clients .