It contained very little hydrogen and helium.

它含有非常少的氢和氦。

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Like other stars, the sun is a big ball of gases — mostly hydrogen and helium atoms.

与其他恒星一样，太阳也是一个巨大的“气球”——大部分主要为氢原子和氦原子。

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Like its bigger neighbor Jupiter, Saturn is a gas planet made mostly of hydrogen and helium.

就像比它更大的邻居-木星一样，土星也是气体行星，主要由氢和氦所组成。

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If we look at n equals one, here is n equals one, hydrogen and helium.

先看n等于1的情况，这里有个n等于1的例子，氢和氦。

麻省理工公开课 - 固态化学导论课程节选

It could be hydrogen, it could be helium plus, it could be lithium double plus and so on.

它可能是氢，可能是带一个正电荷的氦，也可能是带两个正电荷的锂，等等。

麻省理工公开课 - 固态化学导论课程节选

Neither the Big Bang, nor the Steady State versions of cosmology account for any but the lightest elements hydrogen and helium.

ECONOMIST: Sir Fred Hoyle

The inner two appear, from their densities, to have a lot of water or methane or ammonia in them (or any mixture of the three), along with hydrogen and helium.

ECONOMIST: The search for other Earths is hotting up

Dr Marcy suspects that his new discovery, which has about 45 times the mass of the Earth, is composed of a rocky core surrounded by a thick envelope of hydrogen and helium gas.

ECONOMIST: Extrasolar planets