With Green Freedom, they would pass the air over a solution of potassium carbonate added to the cooling liquid.
“绿色自由”设想让空气经过加入了碳酸钾为成分的冷却液。
"Potassium carbonate is like a vacuum for CO2," Martin explains.
“碳酸钾就像二氧化碳的真空吸尘器，”马丁解释道。
Examples are sodium carbonate and potassium acid phthalate which are used to standardize acid and base solutions.
例如碳酸钠和邻苯二酸氢钾，分别用来标定酸和碱溶液。
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