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.

Race length can be either a time or a number of laps .
Race length can be determined by a number of laps or total time , in which case the number of remaining laps is calculated as the race progresses .

Pelagia noctiluca is a jellyfish .
Pelagia noctiluca is a jellyfish in the family Pelagiidae and the only currently recognized species in its genus .

The carcinogens in them are caused by the radiation they release , such as gamma rays or alpha particles .

Several radioactive substances are considered carcinogens , but their carcinogenic activity is attributed to the radiation , for example gamma rays and alpha particles , which they emit .