Wire the thermometers up to trigger off an alarm bell if the temperature drops.把温度计用电线连上，这样温度下降后就会触发警铃。Mercury can be found in meteorological equipment such as thermometers and barometers.温度计和气压表等气象设备中都要用到汞。Mercury is used in batteries, pesticides, and thermometers.水银用于电池、杀虫剂与温度计中。