역활role출연appearance반복to repeat공연performance각 배우들each actors구성composition해파리jellyfish거의almost, nearly알려지다to be well known먹잇감prey성분ingredient, component게다가in addition피해to damage생태계ecosystem이루어져 있다.to consist목적지destination기기machinery and tools; equipment편리하다to be convenient진땀을 흘리다to sweat in a difficult situation; "to shed sticky sweat"
