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A cow's estrus cycle averages 21 days.是什么意思？

A cow's estrus cycle averages 21 days.

母牛的发情周期平均为21天.

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；
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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。
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他坐在那儿，听我陈述解雇他的理由。
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一份耕耘，一份收获。
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该法令迫使工会推迟罢工。
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邻居们很敬重他。
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在法国十分尊重谈话技巧.
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这种发展观在本性上是不可持续的.