What is a knot?

Making enemies is making enemies, making enemies or creating contradictions that are difficult to solve.

Liang Benyi refers to a long horizontal crossbar, which supports the roof on the wall or column and bears the heavy objects on the beam. There are main beams (buildings, girders and roofs), secondary beams, middle beams, upper beams and lower beams. Beam-tying refers to the combination between beams and columns in the process of building wooden houses. It is a stable mutual support structure that extends to mutual support, so that it is difficult to make enemies or conflicts forever.

Making problems means making enemies. If A and B have bad blood after experiencing something, it can be said that they have made an issue.