Manchester United preseason summary: Three major problems still plague Manchester United. Can it be solved before playing for Arsenal?

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I don't know the solution, I can only eat whether the food is salty or light, but I don't know how to make better dishes. Manchester United is very strange. When Manchester United does not have these three problems, Manchester United usually performs well, and then gives me a lot of confidence. But in a blink of an eye, Manchester United will put the old problems in front of you and tell you that I am still the same Manchester United.

From four defenders + double midfielders, to four defenders + single midfielders, to today's three central defenders, Manchester United's problems have always been similar, and they are obvious.