Jobs had been taught by his father that microphones always required an electronic amplifier.
乔布斯的父亲曾经告诉过他，话筒一定要有电子放大器才能工作。
Electronic amplifier
原声例句
乔布斯传
英语百科
Amplifier
An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the power of a signal.
It does this by taking energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. In this sense, an amplifier modulates the output of the power supply to make the output signal stronger than the input signal. An amplifier is effectively the opposite of an attenuator: while an amplifier provides gain, an attenuator provides loss.
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