TASK DEFINITION: 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.
PROBLEM: A running gag is an humorous joke or reference that is used several times in a work or series of works .

SOLUTION: A running gag , or running joke , is a literary device that takes the form of an amusing joke or a comical reference and appears repeatedly throughout a work of literature or other form of storytelling .

PROBLEM: It is used as a reinforcing material for many polymer products .

SOLUTION: 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 " .

PROBLEM: Two common ways of writing it are sa / vol or SA : V. Either of these say to divide the surface area by the volume .

SOLUTION:
The surface-area-to-volume ratio , also called the surface-to-volume ratio and variously denoted sa / vol or SA : V , is the amount of surface area per unit volume of an object or collection of objects .

