Finally, you can preview the sound effect by clicking preview in the Echo window, shown in Figure 4.
最后，您可以单击echo窗口的Preview预览音效，如图4所示。
Emit some output in the window named one by typing echo in that window.
在one窗口中输入echo，在此窗口中产生一些输出。
Emit some output in the window named one by typing echo in that window.
在one窗口中输入echo，在此窗口中产生一些输出。
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