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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；
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