您不需要录制语音文件来测试应用程序。

You do not need to record the audio files to try out the application.

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第三步——录制语音文件

Third pass - Recording audio files

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重要：如果是在后来才在项目中添加dtmf，那么就需要您以修正过的用语来录制发音语音文件。

Important: Adding DTMF later in the project will require that you record the speech audio files with the revised wording.

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