Since the usual test for protein in animal feed just measures the level of nitrogen, these chemicals can be added to far more expensive feed ingredients without anybody noticing.
因为一般的测定动物食物的测试只测量其中氮的含量，这些化学物质可以被加入昂贵的食物成分中而不为人所知。
Companies using the milk for further production (e.g. of powdered infant formula) normally check the protein level through a test measuring nitrogen content.
而使用牛奶进行下一步加工(比如婴幼儿配方奶粉)的公司，一般通过测量含氮量来检测蛋白质含量。
Melamine is high in nitrogen, and most protein tests test for nitrogen levels.
三聚氰胺含氮量很高，而绝大多数蛋白质检测仅检查氮含量。
Melamine is high in nitrogen, and most protein tests test for nitrogen levels.
三聚氰胺含氮量很高，而绝大多数蛋白质检测仅检查氮含量。
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