接触很大的噪音会造成部分失聪，或完全而聋。
Exposure to loud noise can produce a partial or complete loss of hearing.
萨克斯写了一次去玛莎葡萄园的经历。那的失聪人群是一个手势语的群体，他们都是先天遗传性的，在250多年的岁月中无法摆脱这种命运。他们中的大部分听力没问题，但是仍然用手势交流。
Sacks writes of a visit to the island of Martha's Vineyard, where hereditary deafness was endemic for more than 250 years and a community of signers, most of whom hear normally, still flourishes.
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