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1·The ore was heated in the kilns to drive off water and carbonic acid gas.

矿石被放入窑里加热，蒸发掉水和碳酸气。

2·Also eat some fruits, milk and a small amount of soft drinks containing carbonic acid gas.

还可吃一些水果，牛奶以及少量含碳酸气的饮料。

3·Expose the surface of the ocean to an atmosphere with ever more carbon dioxide, and the gas and waters will produce carbonic acid, lowering ph on a planetary scale.

要是海洋的表面与含更高二氧化碳的大气层接触，那么水和气会产生更多的碳酸，在全球范围内降低PH值。