This study research different exercise project for the special quality of college student feel anxious influence.

本研究主要研究不同锻炼项目对大学生特质焦虑的影响。

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This exercise helps you learn how to project your voice to various distances and directions at different voice volumes.

在训练发声系统期间，分别使用高、中、低三种音量来重复以上练习。

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