这些医疗设备用来照射血液，以杀死有害病毒。

These medical devices are used to ___irradiate the blood to kill harmful viruses.

他的笑声像阳光一样照亮了整个房间。

His laughter ___illuminated the whole room like sunshine.

她的话语里洋溢着乐观的精神。

Her words are ___radiant with an optimistic spirit.