兰郑长成品油管道

• 长(long hair; old person (pictographic))ASSOCIATIVE

An old person with long hair cascading down symbolizes something lasting a long time.

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

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

• 口(mouth; mouth opening)RADICAL

Three mouths combined together symbolize diverse kinds and varied qualities of merchandise.

• 氵(water; liquid)RADICAL
• 由(from; due to; oil (phonetic))PHONO-SEMANTIC

Oil is a liquid that flows from a natural source.

• ⺮(bamboo)RADICAL
• 官(official; manage)PHONO-SEMANTIC

A bamboo tube is managed by officials, so 管 means both tube and to manage.

• 辶(step; move)RADICAL
• 首(head; lead)PHONO-SEMANTIC

The head leads the way for feet to follow down a path.