倒啤酒的时候也会起泡，不过即使啤酒已经倒好了，溶解在酒里的气体，主要是二氧化碳，就会跑出来并在玻璃杯壁的成核处变成小气泡。
The act of pouring will generate foam in beer, but even once the beer is poured, dissolved gas, chiefly carbon dioxide, will break out into small bubbles at nucleation sites along the glass wall.
起泡剂是能够发生化学反应并产生气体的物质。
Foaming agent is a chemical reaction can occur and produce gases.
该起泡也有不锈钢丝网屏幕的气体要穿过它退出之前的起泡。
The bubbler also has stainless steel wire mesh screens which the gas has to pass through before it exits the bubbler.
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