血氧量

• 皿(bowl; dish)RADICAL
• 丿(drop of blood; blood drop)ASSOCIATIVE

Blood is a small red drop of liquid flowing down into a bowl—picturing blood dripping into a vessel.

• 气(air; vapor)RADICAL
• 羊(goat)PHONETIC

Gas with a tone like 'dương' is oxygen—the gas that sustains all living things.

• 旦(dawn; daybreak)PHONETIC
• 里(village; mile (unit of measurement))RADICAL

Measure each mile of the road right from dawn's first light.