| 单词 | phonodeik | 
| 释义 | phonodeiknoun  pho·no·deik   ˈfōnəˌdīk    plural -s     : an instrument for making photographic records of sound waves in air by means of a tiny mirror that is oscillated in a rotary manner by sound waves agitating a glass diaphragm and that by its reflections of a ray of light traces corresponding paths on a moving film   | 
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