The company offered little 'by way of explanation' for the delays. [=as a way of explaining why there were delays]
Some of the more technical terms need/require 'explanation'. [=they need to be explained]
a likely/probable/possible/plausible 'explanation of' how the accident occurred
(..) If you go to war with your own kind. If you do this, you will lose the Horde. Well. There has to be an explanation. Yes. She made her choice. Maybe you and I didn't know her as well as we thought we did. There is no greater blessing (..)2016 Warcraft