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.

Input: Consider Input: An artesian aquifer is trapped between rocks or clay which causes the pressure .

Output: An artesian aquifer is trapped water , surrounded by layers of impermeable rock or clay which apply positive pressure to the water contained within the aquifer .

Input: Consider Input: The United States National Guard is an organization of the United States Army and the United States Air Force .

Output: The National Guard is a joint activity of the United States Department of Defense ( DoD ) composed of reserve components of the United States Army and the United States Air Force : the Army National Guard and the Air National Guard , respectively .

Input: Consider Input: Hero ( or Heron ) of Alexandria ( c . 10 70 CE ) was an ancient Greek mathematician and engineer .
Output: Hero of Alexandria ( ; Greek : , " Heron ho Alexandreus " ; also known as Heron of Alexandria ; c . 10 AD c . 70 AD ) was a mathematician and engineer who was active in his native city of Alexandria , Roman Egypt .