红外线

• 糹(thread; silk fiber)RADICAL
• 工(craftsman; work)PHONO-SEMANTIC

A thread dyed by the craftsman becomes bright red.

• 夕(evening; crescent moon (pictographic))RADICAL
• 卜(divination; fortune-telling)PHONETIC

Evening outside divining fortunes under the moon — that's an external affair.

• 糸(thread; silk)RADICAL
• 泉(stream; water)PHONETIC

A thin thread flows like a small stream running long and continuously.