- push button tone pair
- 按钮: push-button; press-button; b ...
- 双音: double tone
- 双音: double tone◇双音多频 dual-tone multifrequency; 双音信号发生器 double-tone signal oscillator; 双音振荡器 double tone oscillator
- 按钮: push-button; press-button; button; depressed button; gauge peg; hand [key; snap; pressure] button; operating lever latch knob; press knob; snap-fastener; thumbpiece◇按钮操纵 push-button control; dash control; 按钮电话机 push phone; push-button telephone set; 按钮开关 press-button switch; button switch (bs); push-button (switch); push-button actuator; face contact
- 双音调: tone dual; tone, dual
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