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最近国外发明了一种对于听力衰弱的人是非常有用的助听器.称为超小型助听器,只有3.5克重,使用时放在耳朵内部靠近耳鼓膜.所以在使用的时候,其
Recently, a foreign country has invented a hearing aid that is very useful for hearing impaired people called the ultra-small hearing aid, only 3.5 grams, when used inside the ear close to the ear drum so when in use, its