真空管助听器 vacuum hearing aid ; vacuum tube hearing aid ; vcuum hering id
真空助听器
Vacuum hearing aid
以上为机器翻译结果，长、整句建议使用 人工翻译 。
它们能用在不宜采用真空管的装置上，例如能用在放在耳朵内的助听器里。
They can be used in devices for which vacuum tube valves were unsuitable, such as in hearing AIDS designed to fit into the ear.
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