在瑞士的苏黎世地区有一个几乎不存在任何声音的地方，这就是 IBM 的无声实验室，据说耗资 9000 万美元的纳米技术工厂的一部分。这个实验室的消音措施非常有效，如果把耳朵靠近墙壁，会因内耳压力失衡而头晕目眩甚至呕吐。

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