Don't actors talk when watching movies? Can voices speak?

Actors who make movies must speak, which is a very important link to express the feelings of the characters. Being unable to speak will only affect the performance of the actors. There are only two kinds of movies and TV, one is simultaneous interpretation, that is, the finished products we saw later were what the actors said at that time, which required a higher level of live performance, and they would clear the scene and keep quiet. There is also post-dubbing, that is, after the film is finished, the professional dubbing artist dubs the role. Then if the actor is on the scene, the audience can't hear it, and it can only be used as a performance.