周期性

• 冂(surround; border)RADICAL
• 土(earth; soil; ground)ASSOCIATIVE
• 口(mouth; door)ASSOCIATIVE

A territory surrounded by boundaries like earth and gates enclosed all around.

• 其(that; that one)PHONETIC
• 月(moon; month)RADICAL

Watch the moon's phases wax and wane to count periods of time.

• 忄(heart; mind)RADICAL
• 生(be born; live)PHONO-SEMANTIC

Nature is something that is born together with the heart of each person.