边际成本

• 辶(step; move)RADICAL
• 力(strength; power)PHONETIC

Walking along the edge requires using force to take each step carefully.

• 丁(nail; peg; stud)PHONETIC
• 戈(weapon; spear)RADICAL

Hold the spear and halberd to fight to the end in order to achieve success.

• 木(tree; wood)RADICAL
• 一(mark; position indicator)ASSOCIATIVE

A horizontal line at the base of a tree marks the root—that is the foundation, the essential base.