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

As we see a little bit later, I could talk about the carbon-hydrogen bond in methane where there is a plurality of bonds. In this case, there is only the one bond but I just want to get the formulas.

因为我们后来看到一点点，我能讨论甲烷中的碳氢共价键,那有许多共价键，这种情况下，这只有一条共价键,但我想得到氟。

麻省理工公开课 - 固态化学导论课程节选