exothermic
adj. 发热的;放出热量的;[热] 放热的
例句
Is Hell exothermic or endothermic?
地狱是放热还是吸热?
Whether the reaction is exothermic or endothermic.
反应是放热的还是吸热的。
Exothermic, that means that it's putting out heat.
放热意味着放出热量。