I doubt images alone are enough. China has had access to Russian jet engines for half a century and still struggles to produce their own.
But can the original chef that wrote the recipe produce the same thing several million or billion times a year?
That’s the thing with the chefs - you can’t make a mammoth dish because there are no more mammoth to cook.
In the nuclear weapons case we deliberately dismantled it.
I'd say that is actually a good thing. Nukes are meant not to be used. They are a deterrent, so it's important they exist, that they are functional, and that you are willing to use them to hit hard against an aggressor. MAD kept us alive until now.
They seem to be struggling a lot with airliner engines, yes, but they've only recently even considered making them. Even then, the WS-20 has entered service, and if it matches claimed specifications, it's as good as anything Russia has either.
And of course the engines for strategic lift planes are based around efficiency first.
Both modern fighter jets and airliners use turbofan engines, the difference is the bypass ratio (hence the size of the bypass blades). For both low and high bypass, Chinese engines are supposedly better than Russian engines. They aren't better than Western engines but they're not that far apart. As far as airliners, the airliner engine is a different design from the WS-20 because of different requirements. It started development far later than the WS-20 and it has been flight tested after only 5 years, which isn't bad at all.