The phrase 'necessary explanation' is correct and usable in written English.
It is typically used to indicate an explanation that is required in order to fully understand a given topic. For example, "I need to give a necessary explanation of the project to the board of directors in order to get their approval."
It is a necessary explanation.
There's a long scene of necessary explanation here.
All professional football teams train hard, so grit can't be the necessary explanation for the Seahawks' success.
Spokeswoman Hua Chunying, speaking at a regular press briefing on Monday, also urged the US to "pay attention to the international community's concerns and demands and give … the necessary explanation" of its surveillance activities.
Earlier results, especially redundant-target processing times which are faster than predicted by the race-model inequality (Miller, 1982), implicated coactivation as a necessary explanation of redundant-target processing.
"It has been formally requested that the U.S. authorities conduct a full investigation of this diplomatic incident and provide the necessary explanation" of the violence that occurred outside the Turkish embassy in Washington last Tuesday, the statement said. .
Afterward, if your auditory nerves have not sustained permanent damage, you will hear some necessary explanations, which complete the epic voice-over of the opening scenes.
The fact that we are five hours in out of six and nothing has actually happened yet is a minor concern, but at least this time I care what the ending will be and may even be able to decipher the necessary explanations along the way.
We have supported our thesis with meaningful examples, necessary explanations, and comparative studies.
"We are going to demand the maximum rigor in the use of all data and we'll provided all necessary explanations," Victoria told reporters at the opening of a home for the elderly.
This is a surprising statement, because all necessary explanations are actually given in the technical research paper on which these series are based (see Piketty-Postel Vinay-Rosenthal AER 2006) and in the chapter 10 excel file (see sheet "TS10.1DetailsFR").
