阉牛是一只去势的公牛。

An ox is a bull that has been castrated.

他们约在七年之前将这家畜去势。

They had the animal neutered some seven years back.

结论：YFN可以改善去势高血脂大鼠血脂水平。

Conclusion: YFN can ameliorate blood lipids of ovariectomized hyperlipidemia rats.

目的：探讨雌二醇、孕酮对去势小鼠外周血白细胞和淋巴细胞的调节。

Objective: to investigate the regulation of estradiol and progesterone on leukocyte and lymphocyte of peripheral blood in ovariectomized mice.

目的研究盐酸曲唑酮对去势雄鼠血清一氧化氮（NO）水平的影响。

ObjectiveTo study the effect of trazodone on serum NO level in castrated male rats.