Large quantities of nitric acid were produced.
大量的硝酸产生了。
Saliva acts as a barrier, protecting the teeth by neutralising acidic foods such as oranges, and the acid produced by bacteria as they break down foods.
而唾液正像一道保护牙齿的屏障，把橘子等酸性食物以及细菌分解食物产生的酸性物质中和掉。
These include stripping it out of the tailings from gold and copper mines, and also from phosphoric acid produced during the manufacture of fertiliser.
其中包括从金矿和铜矿的矿尾中提取铀，以及利用化肥制造过程中产生的副产物硫酸。
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