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The sperm hyaluronidase from white and black pibald fine breed bullswas isolated and purified by ammonium sulphate fractionation and sephadaxchromatography.

中国黑白花优良种公牛精子透明质酸酶经硫酸铵分级沉淀和 Sephadex 柱层析分离纯化,得到一个电泳纯品,活力纯化40倍。

Controlled trials were conducted to investigate the effects of two thawing solutions on bull′s sperm survival time and integrity acrosome rate.

9%柠檬酸钠 ,对照组 )对肉用种公牛颗粒冻精进行解冻对照试验。

A young cow or bull.

小牛年幼的母牛或公牛

A castrated bull;a steer.

阉公牛，已肥育阉公牛

yearling heifer or bullock.

一岁的小母牛或小公牛。

A bullock is a castrated bull.

阉牛是去势的公牛.

An ox is a castrated bull.

阉牛是经过阉割的公牛。

The bull was riding the cow.

公牛正跨骑在母牛上。

"beef:a full-grown steer, bull, ox, or cow, especially one intended for use as meat."

牛:完全成长的阉牛、未阉割的牛、公牛或母牛,尤指因肉用而蓄养的牛。

A full-grown steer, bull, ox, or cow, especially one intended for use as meat.

牛完全成长的阉牛、未阉割的牛、公牛或母牛，尤指因肉用而蓄养的牛

A milk cow is a female, a bull is a male of the same animal.

奶牛是母牛，而公牛则是这种同类动物的雄牛。

The flesh of a slaughtered full-grown steer, bull, ox, or cow.

牛肉宰杀了的完全成长的阉牛、未阉割的牛、公牛或母牛的肉

The young bull horned the old cow out of the herd.

小公牛用角把老母牛从牛群中顶了出去。

The roar of a large animal, such as a bull.

牛吼大型动物的吼叫声，如公牛

Have you read the book" The Heifer and the Ox"?

你读过《小母牛与公牛》这本书吗?

A fenced enclosure for confining bulls.

牛栏为关公牛而做的围栏

The bull tossed the matador.

公牛用角把斗牛士挑起后抛入空中。

a soft thick undyed leather from the skins of e.g. buffalo or oxen.

一种软而厚的天然色水牛或公牛皮革。

The cowboy led in his prize winning Bull.

牛仔把他得奖的公牛引导入内。

The bull was busy with the matador at the time,

当时那公牛正忙于对付斗牛士，