... electric buzzer 电蜂鸣器 Warning buzzer 蜂鸣器 ; 蜂鸣警告器 buzzer exciter 蜂鸣激励器 ; 蜂音激磁机 ...
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terminal electric buzzer 终端机电子蜂鸣器 ; 终端电气蜂鸣器
electric magnetic buzzer 电磁蜂鸣器
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The principle of his "invention" is that when the water level reaches the two metal strips the water closes the electric circuit, thus the buzzer sounds to warn the user that the cup is full.
这项发明的原理是当水位线升高至两条金属线之间的时候，水阻断电路。蜂鸣器则警示水杯已呈满水。
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