J.J. Balmer, who was a school teacher in the 1800s, was the first to describe these lines that could be seen from hydrogen.
J.J.Balmer，在19世纪是一名教师，他是第一个描述这些可以从氢气中看到的线条的人。
Some are very characteristic absorption lines: some for hydrogen, some for calcium, some for silicon, some for magnesium and so on.
有些是非常，典型的吸收线：，有些代表氢元素，有些代表钙元素，有些代表硅元素，有些代表镁元素等等。
So, even though the lines were wrong, he says, no, that is hydrogen.
所以，即使那光线是错误的，他说，不，它就是氢。
This particular galaxy is described as Seyfert 1 galaxy, which typically have bright centres emitting a broad range of hydrogen emission but narrow emission lines of heavier elements such as iron.
这个特别的星系归类于塞弗特1型星系，这是由于它拥有一个向四周大范围辐射氢元素的明亮核心，但奇怪的是，它还拥有数条狭窄的重元素发射带，例如铁元素。
Hydrogen pipes for two production lines were interconnected so as to share the hydrogen-generating devices with ammonia decomposition technology and insure protect gas supply for the two lines.
将两条生产线氢气管道进行联网改造，达到两条生产线氨分解制氢装置互为备用，增加系统供气可靠性的目的。
Hydrogen pipes for two production lines were interconnected so as to share the hydrogen-generating devices with ammonia decomposition technology and insure protect gas supply for the two lines.
将两条生产线氢气管道进行联网改造，达到两条生产线氨分解制氢装置互为备用，增加系统供气可靠性的目的。
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