The numbers have faded; so you can't tell where zero is on the barometer.气压表上的数字已经隐褪了，所以看不出零度在哪里。The barometer recorded a low pressure.气压表标明有一低气压。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。