When you add water to baking powder, the dry acid and base go into solution and start reacting to produce carbon dioxide bubbles.
当你往泡打粉里加了水，干粉状态的酸和碱溶化，并开始反应，生产出二氧化碳气泡。
If good hygiene doesn't sweeten your breath, see your dentist and your doctor. Gum disease, dry mouth, or acid reflux could be part of the problem.
如果保持良好的健康习惯仍无法缓解你的口气状况时，找牙医和大夫看看，这种口臭可能是由牙龈疾病，口腔干燥，或胃反酸造成的。
We are all used to these fancy dry cells, but in the old days, and still nowadays in your car, there are acid batteries.
我们都习惯了这些好用的干电池，但在过去，和现在在你车里，有酸性电池。
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