One group was given a button that would shut off the noise and was told to feel free to use it but only if the noise became too great to bear.
其中一组是一个按钮，将关闭的噪音和被告知随时使用它，但只有在成为噪音过大负担。
One group was given a button that would shut off the noise and was told to feel free to use it but only if the noise became too great to bear.
其中一组是一个按钮，将关闭的噪音和被告知随时使用它，但只有在成为噪音过大负担。
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