亚硝酸

例句：

1. 1. The chemicalwas used as a preservative infood processing.
   这种化学物质在食品加工中用作防腐剂。
2. 2. The meat was contaminatedwith nitrite, which is dangerousfor human health.
   肉被亚硝酸污染了，对人类健康有害。
3. 3. Nitrites are found naturallyin some vegetables and can beconverted to nitrates duringcooking.
   一些蔬菜中含有亚硝酸盐，烹饪过程中可以转化为亚硝酸盐。