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母牛的发情周期平均为21天.用英语怎么说？

母牛的发情周期平均为21天.

A cow's estrus cycle averages 21 days.

相关词汇
estrus cycle averages days

estrus

n. 动情期，动情周期，发情；

cycle

n. 循环，周期，自行车，时代，一段时间，整套；vi. 周而复始，循环，骑自行车，轮转；vt. 运转，循环，使轮转；

averages

n. 平均水平( average的名词复数 )，（速度等的）平均率，平均估价；

days

n. 天，时期，一天( day的名词复数 )，白天，时期，工作日；adv. 每天，在白天；
热门例句
He acknowledged publicly that he might have made a mistake.
他当众承认自己可能犯了个错误。
...the spiralling vortex airflow that slows the plane.
使飞机减速的螺旋形气流涡旋
You just go on ahead. I'll come by later...
你只管先往前走。我随后就来。
He who spares his rod hates his son, But he who loves him chastens him early.
24不忍用杖打儿子的,是恨恶他;疼爱儿子的, 趁早管教.
For further information, please contact 414 3925, extension 2253.
详情请致电414 3925,转分机2253。
Baroness Thatcher's claims seem credible to many.
撒切尔女男爵的主张在很多人看来是可信的。
He sat there while I made the case for his dismissal...
他坐在那儿，听我陈述解雇他的理由。
Nothing to be got without pains but poverty.
一份耕耘，一份收获。
This decree obliges unions to delay strikes.
该法令迫使工会推迟罢工。
The right to demand payment from the endorser of a commercial paper when the first party liable fails to pay.
追索权当有支付义务的第一方不能支付时，可以向商业票据的背书人要求支付的权力。
相关例句
When the estimator is unbiased, the numerical estimate is frequently also called unbiased.
当估计量无偏时, 数字估计值也常叫做无偏的.
The quarrel led to a complete estrangement between her and her family.
这一争吵使她同家人完全疏远了.
Purpose : To analyse the MR manifestations and clinical significance of Empty Sella Syndrome ( ESS ).
目的:分析空蝶鞍综合征 ( ESS ) MR表现及临床意义.
Stage is difficult to determine until eschar has sloughed or has been surgically removed.
在焦痂脱落或手术去除前难以确定其分期.
Different models of abstract criticism make different types of esthetic narration.
不同的抽象批判样式构成了不同的美学叙事.
They finally came together after years of estrangement.
在多年不和之后,他们终于言归于好了.
the basic essentials of life, i.e. housing, food and water
生活的基本需要，即住房、食物和水
Who is the best candidate in your estimation ?
你认为谁是最合适的人选？
The possible protective mechanism of estradiol is releasing.
降低体内NO含量是脑保护的可能机制.
Objective To study the clinical effect of the Tropicamide Eye Drops to treat the esotropia.
目的探讨采用双星明治疗共同性内斜视的临床效果.
His opportunity to re-establish himself had been nobbled by the manager's tactics.
他重新树立自己地位的机会因教练的战术而流产了。
Games using the direction keys control aircraft, CTRL opened fire ESC.
游戏中用方向键控制飞机, CTRL开火,ESC退出.
Although things are changing the medical establishment is still overwhelmingly male.
虽然世易时移，但医学界依然是男性的天下。
You should not, of course, stop reading this estimable newspaper.
当然, 你不应该抛弃这份宝贝的报纸.