Thanks for your answer.
Sometimes it is the answer for my question, but after reading it for the first time, I don't understand it technically (I'm photoreading a lot of technical books), although it is clear that the passage contains what I'm looking for (sometimes the passage does not contain the answer for my aim, but in this case it is clear for me that I should move on).
So, in case that I find a text passage and it is clear to me that this passage has what I'm looking for (I know that because of some trigger words founded in this passage) should I read it until I understand it completely or move on and come back later to it?