Wire the thermometers up to trigger off an alarm bell if the temperature drops.
把温度计的电线连接上，当温度下降时，就会触发警报。
The first voice to travel over a wire was even a surprise for its inventor. Alexander Graham Bell.
通过电线传送的第一个声音，甚至使它的发明人亚历山大·格雷厄姆·贝尔都感到惊讶。
The present invention discloses welding repair method and welding wire for steel rail, Bell frog and switch rail.
本发明公开了一种钢轨、贝尔岔心和尖轨的焊修方法及其焊丝。
The principle, normal troubles and precautions for bell-jar wire coiler are introduced.
介绍了钟罩式卷线机的工作原理、常见故障及预防措施。
The principle, normal troubles and precautions for bell-jar wire coiler are introduced.
介绍了钟罩式卷线机的工作原理、常见故障及预防措施。
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