He did not milk cows because he was obliged to milk cows, but because he was learning how to be a rich and prosperous dairyman, landowner, agriculturist, and breeder of cattle.
他要挤牛奶并不是因为他非要挤牛奶不可，而是因为他要学会怎样做一个富有的、兴旺发达的奶牛场老板、地主、农业家和畜牧家。
The content of Cu in serum and hoof horniness of normal milk cows was lower than hoof disease milk Cows, but the content of Zn in serum of normal higher than of hoof disease Cows.
正常牛蹄角质和血清中铜含量低于病牛，而正常牛蹄角质和血清中锌含量高于病牛。
Conclusions: a certain levels of E2 and P4 in milk which come from either pregnant cows or commercial whole milk mainly from pregnant cows may perhaps increase serum HDL-C of juvenile female SD rat.
结论：妊娠奶牛奶或以妊娠奶牛奶为主的市售纯牛奶中一定水平的E2和P4可能升高雌性SD幼鼠血清hdl - C水平。
Conclusions: a certain levels of E2 and P4 in milk which come from either pregnant cows or commercial whole milk mainly from pregnant cows may perhaps increase serum HDL-C of juvenile female SD rat.
结论：妊娠奶牛奶或以妊娠奶牛奶为主的市售纯牛奶中一定水平的E2和P4可能升高雌性SD幼鼠血清hdl - C水平。
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