Because of the particularity of acousticarea transition and mixed sound, the problem of tenor is always difficult to solve.
因声区转换及混声的特殊性，男声的高音演唱问题一直是比较难解决的。
2
Other proposed USES for the self-plucking acoustic fibres include nets that monitor the flow of water in the ocean and large-area sonar imaging systems.
这种自拨声音纤维的其他的应用还包括，监测海洋和大面积声纳成像系统中水流的网。
3
Acoustic processing and echo control Sound pickup and playback is an important area of multimedia processing.