sound projection

1. We use the sensibly perceptible sign ( sound or written sign, etc.) of the proposition as a projection of the possible state of affairs.
   我们用命题中可由感官感知的符号（声音的或书写的符号，等等）来作为可能出现的事态的投影。
2. High-magenta dye sound track projection and red light LED maintenance.
   高品红染料声迹放映及红光LED的维护保养。
3. Sound Projection Characteristic in Sliding Failure of Enclosing Rock within Stope along Structure Plane
   采场围岩沿结构面滑移破坏时的声发射特征

noun

1. the acoustic phenomenon that gives sound a penetrating quality
   1. our ukuleles have been designed to have superior sound and projection
   2. a prime ingredient of public speaking is projection of the voice

   Synonym:    projectionacoustic projection