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留声机和助听器爱迪生一生获得了许多项发明的专利权,其中留声机的发明使他最为得意。当有人问他为什么不发明一种助听器时,爱迪生答道:“你在过去的24小时内听到的声音,有多少是非听不可的呢?一个人如果必须大声喊叫,就绝对不会说谎。”用得着吗爱迪生对于穿着不太在意。有一
Phonographs and hearing aids Edison received numerous invention patents throughout his life, of which the invention of the phonograph made him the most proud. When asked why he did not invent a hearing aid, Edison replied: “How much of your voice has you heard in the past 24 hours? If you must shout aloud, you never tell a lie. ”Edison need not care about wearing it. There is one