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:
It is used as a reinforcing material for many polymer products .
answer:
Glass fibers are therefore used as a reinforcing agent for many polymer products ; to form a very strong and relatively lightweight fiber-reinforced polymer ( FRP ) composite material called glass-reinforced plastic ( GRP ) , also popularly known as " fiberglass " .

question:
The Civil Registry and Identification Service is an institution for public service in Chile .
answer:
The Civil Registry and Identification Service is the Chilean public service in charge of registering civil statuses of persons and other issues which , by law , it has to register .

question:
Hungary opened its borders to citizens of East Germany on 11 September 1989 .
answer:
On 11 September 1989 , Hungary opened its borders to citizens of East Germany and other Central European countries ; this was the first time a Central European border was opened to citizens of Eastern Bloc states .