考夫曼博士表示，由于国家规定防腐剂必须为高酸性，精加工与灌装食品的酸性尤其的强。
Processed and bottled foods are particularly acidic because of federal rules requiring high acidity as a preservative, Dr.Koufman says.
pH值越低，酸性越高；无糖苏打饮料（pH2.9-3.7）、草莓（pH3.5）以及烧烤调味酱（pH3.7）等食物饮料均属高酸食品。
The lower the pH, the higher the acidity; highly acidic foods and beverages include diet sodas (2.9 to 3.7), strawberries (3.5) and barbecue sauce (3.7).
考夫曼博士表示，由于国家规定防腐剂必须为高酸性，精加工与灌装食品的酸性尤其的强。
Processed and bottled foods are particularly acidic because of federal rules requiring high acidity as a preservative, Dr. Koufman says.
出于贮藏的需要，加工过的食品及罐装食品酸性尤其高，联邦法规对此也有相应的高酸规定，考夫曼博士说。
Processed and bottled foods are particularly acidic because of federal rules requiring high acidity as a preservative, Dr. Koufman says.
出于贮藏的需要，加工过的食品及罐装食品酸性尤其高，联邦法规对此也有相应的高酸规定，考夫曼博士说。
Processed and bottled foods are particularly acidic because of federal rules requiring high acidity as a preservative, Dr. Koufman says.
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