平流层

• 干(trunk; stem (horizontal representation))ASSOCIATIVE
• 丷(two diverging strokes; balance)ASSOCIATIVE

An upright tree trunk with two branches spreading equally on both sides symbolizes flatness and fairness.

• 氵(water)RADICAL
• 㐬(swirling flow; whirlpool)PHONETIC

Water flowing in a whirlpool becomes a stream, which is the circulation of water.

• 尸(corpse; roof (covering))RADICAL
• 云(cloud)PHONETIC

Layers of houses stacked on top of each other like tiered clouds beneath a roof.