旧热带界

• 丨(vertical stick; marking stroke)ASSOCIATIVE
• 日(sun; day)RADICAL

Add another stroke to the sun to mark the days that have passed — that is what is old.

• 执(hold; grasp)PHONETIC
• 灬(fire)RADICAL

Fire rising up from below an object being held creates a burning heat.

• 巾(cloth scarf; fabric wrap)RADICAL
• 冖(cover; conceal)ASSOCIATIVE
• 卅(thirty; cord-like shape)ASSOCIATIVE

A belt is a strip of cloth wrapped tightly around the body, covering the waist area.

• 田(field; land)RADICAL
• 介(in the middle; separate)PHONETIC

A boundary is the dividing line between separate fields.