Neon, a rare gas in the air, takes only fractional percentage point of the volume.
Neon, a rare gas in the air, takes only fractional percentage point of the volume.
氖是空气中的稀有气体，只占空气体积的千分之几。
Neon, a rare gas in the air, takes only fractional percentage point of the volume.
氖是空气中的稀有气体，只占空气体积的千分之几。