Traditional editing of two films

1, first leave the place to be edited, trim the edge of the film, stick it with special glue, and finally punch a few holes with a punch. I can do all these things. I used to help my mother stick to this film.

2. Copying is actually a process of film reprinting. When the film was shown, optical copies were used, and then "optical conversion" was made into "optical sound base". Future copies will be printed with this optical sound base.

There is also a concept called "intermediate membrane". In order to make more copies, the film introduced the concept of intermediate film. A negative film is made into a correction film, which is also a film type. The correction film can be made into several reverse films, and finally a large number of copies can be printed with the reverse films. A reverse film can print more than 300 copies.

I don't know. Can you understand me when I say this? This is the latter answer, which I heard from my mother.

PS: My mother works in a cinema.