How to Approach Construction Problems

Правка en1, от pengyule, 2022-06-22 07:59:14

When I do construction problems, I am always unable to find the entrance from which I can find the solution in the tutorial. It seems to me that the tutorial methods are just 无中生有(created out of thin air). How can I find them too?

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en1 Английский pengyule 2022-06-22 07:59:14 267 Initial revision (published)