利用水银柱的高度来量度气压。
The air pressure is determined by the height of mercury column.
气压计的水银柱在下降，看来天气一定要发生变化了。
The glass is going down, so we must expect a change in the weather.
人工测量的血压计是水银柱血压计和气压表式血压计。
Water table is a surface on which the presure is atmospheric.
人工测量的血压计是水银柱血压计和气压表式血压计。
Water table is a surface on which the presure is atmospheric.
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