There is strong evidence that the actors wore masks that were fitted out with small megaphones to assist in increasing the directivity of the voices.
有确凿证据表明当时的表演者们戴着装有小型扩音器的面具，以辅助声音的方向性传播。
2
Consider Figure 1 and the average differences between a small portion of their voices.
考虑图1和一小部分语音之间的平均差异。
3
His oeuvre was small: ten symphonies (the last one unfinished), a symphonic work for voices and orchestra (" Das Lied von der Erde ") and a number of songs.