1、You must speak up and project your voice even if you are using a microphone.

　　2、Your voice should be resonant and sustained when you speak.

　　3、Pitch your voice slightly lower than normal. Listeners tend to associate credibility and authority with a relatively deep voice.

　　4、Try to end declarative sentences on a low tone without, however, trailing off in volume.

　　5、Slow down.

　　1、即使是用麦克风，也要声音响亮并运气发声。

　　2、声音要有回声并能稍持续一阵儿。

　　3、音调要定得比正常讲话时低一些，听众往往把可信度和权威性与一个相对低沉的声音联系在一起。

　　4、尽量用降调结束陈述句，但不要减弱音量。

　　5、放慢语速。