1. A column of mercury in a thermometer. 
   气压计的水银柱
2. shows pressure by the height of a column of mercury. 
   由汞柱的高度测量气压。
3. a unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade. 
   压强单位；在海平面和摄氏度的条件下能支持毫米汞柱。
4. One centimetre equals to 0.01 metre. 
   一厘米等于0。01米。
5. A unit of atmospheric pressure that is equal to the pressure exerted by a one-inch column of mercury at the earth's surface at a temperature of0=C. 
   气压测量单位气压单位，一大气压相当于地面温度为0＝c时的一英寸水银柱的压力

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