名词
中文翻译：手动电报发射机
同义词：
['manual telegraph', 'manual transmission', 'manual transmitter']
例句：
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1. The manualtelegraph transmitter was used to send messages over long distances.
手动电报发射机被用来远距离发送信息。
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2.The manual transmission system is still widely used in some areas.
手动传输系统在一些地区仍然广泛使用。
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3. The manual transmitter was a reliable way to transmit signals in the old days.
手动发射机在旧时代是可靠的信号传输方式。