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。
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