Nitrates are used as preservatives in food processing.
硝酸盐在食品加工中被用作防腐剂。
《柯林斯英汉双解大词典》
2
Food producers make tiny, crunchy breakfast cakes out of true cereal with the addition of sugar, corn syrup, salt, food dyes and preservatives.
食品生产商用真正的谷物，加上糖、玉米糖浆、盐、食用色素和防腐剂，做出又小又脆的早餐蛋糕。
3
Although many foods are naturally rich in salicylates, for the past several decades, food-processing companies have also been adding salicylates to foods as preservatives.