In here, in solution you have all these molecules of solvent, molecules of salt, molecules of acid, or whatever, pH that are going to be around to buffer the pH.
在这里，溶液里包含了所有这些溶剂分子，盐分子酸分子和其它东西，可以用来缓冲。
2
They have the same pH as the skin so they help restore the protective acid mantle–they also possess hydrating, nourishing and astringent properties.
它们有和皮肤相同的pH值，所以它们能帮助恢复皮肤的酸性保护膜——它们还具有保湿、滋养和收敛性。
3
Measurements of the pH of the Coke before and after the experiments showed that its acidity did not change, ruling out the idea that a simple acid-base reaction drives the fountains.