... 振铃试验，发信试验，信号发送试验：signaling test 振铃时间，呼叫时间：ringing period 振铃切断继电器，呼叫电流切断继电器：ringing-trip relay ...
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The Bronze Ever-ringing Bell functions as a constant reminder of the tragically heroic period in history.
这口铜制的长鸣钟警示我们要记住这段悲壮的历史。
The pulse period of the ultrasonic pulse depends on the period of the transmission pulse and on the ringing time of the transducer.
在超声波脉冲脉冲周期取决于传输脉冲周期和时间的传感器铃声。
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