1·Sugars are also carbohydrates, sources of sugars are refined sugar—sucrose, which is a food sweetener and preservative and fruit sugars—fructose.
糖类也是碳水化合物，糖类的来源是精制糖——蔗糖，它是一种食品甜味剂、防腐剂和果糖。
2·Nisin is a natural food preservative produced by certain strains of Streptococcus lactis.
尼生素是由乳酸链球菌产生的一种天然食品防腐剂。
3·They add flavour and act as a preservative but they can be present even in foods you don't expect or are labelled in ways that you don't recognise.
它们可以添加风味，并作为防腐剂，但是它们可以存在于你没有预料到的食品中，或者以你不能识别的方式贴上标签。
4·For example, in virtually every language but English, "preservative" is something you might need on a romantic date but wouldn't want to find in your peanut butter.
例如：事实上，在除了英语之外的其他语言中，“防腐剂”是一样你在[进行浪漫约会的时候所需要的]，而不是[在你的花生酱里找到]的东西。
5·Processed and bottled foods are particularly acidic because of federal rules requiring high acidity as a preservative, Dr.Koufman says.
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。