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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