radiant/ˈreɪ.di.ənt/形容词喜气洋洋的;容光焕发的;光彩照人的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。(热或光)辐射的,放射的,发散的a radiant heater辐射加热器想跟读,去练习