For example, the 'click' of a door being opened may simply serve to convince the audience that the image portrayed is real, and the audience may only subconsciously note the expected sound.

例如，开门的“咔哒”声可能只是为了让观众相信所描绘的图像是真实的，而观众可能只是下意识地注意到预料之中的声音。