种牛现代汉语词典中对奶牛的定义为”乳牛“，对乳牛的定义为“专门养来产奶的牛，产奶量比一般的奶牛高”（1077页，2001年7月出版）所以奶牛就是母的，公的不能产奶，公的叫种牛，并不是叫“公奶牛”。种牛就是用来给奶牛配种的公牛。
几年后，他们说，一群德国人称他的三明治为“汉堡包”，因为来自德国汉布格尔的人们吃这种牛肉。
Some years later, they say that a group of Germans called his sandwich a "hamburger" because people from the German city of Hamburger ate this kind of beef.
捐赠的牛奶可能是罪魁祸首：最近对老鼠的实验室研究表明，给老鼠喂食酪蛋白（一种牛奶蛋白）时，短暂接触过黄曲霉毒素物质的老鼠容易患肝癌。
The donated milk was probably to blame: recent laboratory research on rats has shown that rats briefly exposed to the substances aflatoxin tend to develop liver cancer when fed casein, a milk protein.
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