When it's time to play this file, an audio program needs to actuate the computer's speakers such that the original waveform is emitted.

播放此文件时，音频程序需要启动计算机的扬声器，以便发出原始波形。

We can take a sentence of text, and break it down into its phonetic components, and then play those sounds back to back, out of a computer speaker.

我们可以把一个文本句子分解成语音成分，然后用电脑扬声器连续播放这些声音。

Because this course, rise and fall of super powers, is delivered via CD ROM you will get to know me primarily as a disembodied voice coming out of your computer speakers for which I apologize.

由于大国沉浮这门课是通过，光盘形式发行的我很抱歉，大家只能通过电脑屏幕中的形象和声音认识我了。