(of liquid) clear and thus presumably clean / (of a material) translucent or transparent

in; inside; within (an interior or enclosed space) / within (an amount of time) / in/among (a group) / in (a place in southern Vietnam)

pure, bright / not stained / easy to understand, clear

while

(historical) Central and Southern Vietnam during the 17ᵗʰ–18ᵗʰ centuries

(of voice, etc.) clear; pure

(of water, air, etc.) clear; pure (generally speaking) / (figurative, often of a person) honest; upright

pure; clean; unblemished; untarnished; immaculate

transparent (allowing light to pass through)

clean; pure; unpolluted