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
(..) Nineteen, if you count me. I have to... I have to call my daughter. I know today has been tough. A lot of your colleagues have left, and I owe you an explanation. Many of those who left us today helped build the C.W.I. from the ground up, and I'm grateful to them. But it is time for us to evolve, (..)2013 TvShow: House of Cards Title: Chapter 2 Season: 1 Episode 2