中国科学院

• 口(mouth; rectangular frame)ASSOCIATIVE
• 丨(vertical line through the middle; axis)ASSOCIATIVE

An arrow hitting the center of a target frame is the bull's-eye—that's CENTER.

• 囗(surround; enclose)RADICAL
• 玉(precious jade; gem)ASSOCIATIVE

A nation is enclosed land that contains precious treasures within.

• 禾(rice plant)RADICAL
• 斗(threshing floor; rice threshing area)ASSOCIATIVE

To classify rice grain by measuring each type with a measuring vessel.

• ⺍(two hands (indicating learning))ASSOCIATIVE
• 冖(roof; house)ASSOCIATIVE
• 子(child)RADICAL

A child sitting under a roof with two hands diligently studying represents learning.

• 阝(earth mound; fortification wall)RADICAL
• 完(complete; whole)PHONO-SEMANTIC

A school campus surrounded by sturdy and complete walls forms an enclosed institution.