说明：  在Resources.resx中添加WAV格式的音频，显示windows窗体和其按钮，按钮通过事件处理程序关联，实现循环播放，单次播放和退出功能。
(Resources.resx added in WAV format audio, display windows form and its buttons, button through the event handler associated implementation cycle of play, single player and the exit function.)