In fact, that's also the way we would combine the quantum world, which involves all these particles, with gravity, which from this point of view, Einstein's theory involves one more particle, which is the graviton, or the basic unit of Einstein's gravitational waves.
Note: It sounds like he says "combined" instead of "combine," but that is incorrect grammar.
If you're interested:
It seems like some people think "to combind" is a different way to say "to combine," but there is no such verb. There is only "combined," which is the past tense of "to combine."
In fact, I myself get a little confused about this. It might be an accent thing? I don't know, hehe.