This should make a lot of sense, because we know that a hydrogen has 1 s as it's outer-most or valence orbital, so it can be filled up just with two 1 s electrons.

这也是很合理的，因为我们,知道氢只有，1，s，轨道,这就是它最外层的轨道或者说价轨道，因此只要两个，1，s，电子就可以将它填满。

youdao

From 1973 up to its dismantling in 1998 (to make room for a golf course), its most important mission was a continuous dedicated hydrogen-line SETI search.

从1973年一直到1998年天线被拆除(改为高尔夫培训用)，它的最主要使命就是持续而专注地进行氢线附近的SETI搜索。

youdao