Sounds in response to user activity, such as a click after a keypress, a whoosh accompanying opening and closing windows, or a klunk when a file is deleted.
用声音对用户的行为作出响应，比如在按键之后的滴答声，打开或关闭一个窗口后发出的“嗖”的声音，或者是一个文件被删除后发出的沉闷的声音。
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模块上移
模块下移
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