radiant
adjective uk/ˈreɪ.di.ənt/ us/ˈreɪ.di.ənt/
(HAPPY/BEAUTIFUL)
喜气洋洋的;容光焕发的;光彩照人的
obviously very happy, or very beautiful
He gave a radiant smile when he heard her news. 当他听到她的消息时，脸上绽放出灿烂的笑容。
(HEAT/LIGHT)
[ before noun ]（热或光）辐射的，放射的，发散的
producing heat or light
a radiant heater 辐射加热器
the radiant heat of the sun 太阳的辐射热