萤火虫在夜晚发出微弱而美丽的光芒。

Fireflies emit a soft and beautiful ___luminous glow at night.

她涂了亮橙色的口红，在阳光下格外醒目。

She wore a ___luminous orange lipstick that caught everyone's attention in the sunlight.

她的讲解如此清晰明了，让复杂的概念变得容易理解。

Her ___luminous explanation made the difficult concept easy to understand.