无法退出iMovie,提示有任务没完成，但我又不知道是什么任务
编辑了一个视频后，无法加载音乐，又无法退出该程序。
MacBook Pro 14″
From Google Translate:
尝试强制退出 iMovie（Apple 标志/强制退出）。
Try force quitting iMovie (Apple logo/Force Quit).
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