Helium is a very light gas.

氦是一种很轻的气体。

《柯林斯英汉双解大词典》

Hydrogen is a light gas.

氢是很轻的气体。

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This energy is contained in a very light gas called hydrogen.

它含在一种叫氢气的很轻的气体中。

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One shows the remains of a dying star four thousand light years away which has thrown off a cloud of glowing hydrogen gas.

VOA: special.2009.09.30

These huge groups of stars, gas and dust can be many thousands of light years across.

VOA: special.2009.01.20

The hotel was built of wood. Gas was used to light the building.

VOA: special.2009.06.01

"Prior to the electricity, we came in and had to come with a torch or a candle and light your gas, if you had gas, light your candles, " he said.

BBC: Not seeing the light at Downhill

Mr. OBRADOR: (Through translator) Come December, I will reduce the cost of light, gas and gasoline.

NPR: Mexican Candidate Resists Comparisons with Chavez

Anyway, China is now seeing the light on natural gas according to reports this morning.

FORBES: Even China Gets It: Natural Gas Is The Future