固态放大器.
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a solid-state amplifier
固态放大器
以上为机器翻译结果，长、整句建议使用 人工翻译 。
For instance, a German physicist named Robert Wichard Pohl made a solid-state amplifier in 1938 using salt as the semiconductor.
ECONOMIST: The middle age of the transistor
But the search for a suitable solid-state amplifier took a long and roundabout route.
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