hook-on instrument

常見例句

雙語例句

• The automatic two-way signaling used on these circuits causes the station instrument on one end of the circuit to ring when the station instrument on the other end goes off-hook.
  這些線路上使用的自動雙向信令引起線路一端的電話機振鈴，而另一端的電話機摘機應(yīng)答。
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