档案传输协定

• 木(tree; wood)RADICAL
• 当(bear; correspond)PHONETIC

A wooden file or document case sounds like "đương" (the character's pronunciation).

• 亻(person; man; human)RADICAL
• 专(specialized; dedicated)PHONETIC

A person who transmits knowledge must dedicate themselves to passing it on to others.

• 車(vehicle; cart; wheel)RADICAL
• 俞(agree; transport)PHONETIC

A cargo vehicle traveling everywhere represents the image of transportation and delivery.

• 宀(roof)RADICAL
• 疋(foot in right place; step correctly)PHONO-SEMANTIC

Under a roof with feet standing in the right place, everything is settled and secure.