shining brightly 灿烂的；光辉的 - (of a person or their expression)
showing great happiness or goodness 灿烂的；光辉的 an effulgent smile 灿烂的微笑
Word Originmid 18th cent. (earlier (mid 17th cent.) as effulgence): from Latin effulgent- ‘shining brightly’, from the verb effulgere, from ex- ‘out’ + fulgere ‘to shine’.