某个小组对绘制宇宙中氢的分布图感兴趣，另一个则对定位脉冲星感兴趣，还有的在研究银河系的结构。

One group is interested in mapping the distribution of hydrogen in the universe, another in the location of pulsars, and yet another is studying the structure of our galaxy, the Milky Way.

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他说：“它的废气排放量是零，不排放碳，而且氢是宇宙中含量最丰富的物质。”

It is zero emissions, there is no carbon, he said. And hydrogen is the most plentiful element in the universe.

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他说：“它的废气排放量是零，不排放碳，而且氢是宇宙中含量最丰富的物质。”

"It is zero emissions, there is no carbon," he said. "And hydrogen is the most plentiful element in the universe."

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So what that means is that's how much energy we would have to put into a hydrogen molecule in order to get it to split apart into its two atoms.

它的意义,就是我们需要向一个氢分子中注入这么大的能量,才能将它分解成两个独立的原子。

麻省理工公开课 - 化学原理课程节选

So, why don't you go ahead and tell me, keeping that in mind, which atom in terms of h c or n would you expect to be in the center of hydrogen cyanide?

那么，请大家来告诉我，并且记住它，你认为氢，碳和氮中哪个原子,应该在氰化氢的中间呢？

麻省理工公开课 - 化学原理课程节选

This is the homonuclear bond energy for hydrogen in pure hydrogen. There we have perfect covalency.

这是氢的同原子的共价能,在纯氢中，我们有完美的共价键。

麻省理工公开课 - 固态化学导论课程节选