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“发情”,乃是雌性高等动物特有的一种生理现象。《汉语大词典》“发情”条:“雌性的高等动物卵子成熟前后生理上要求交配的表现。”然而,报刊上雄兽也频频“发情”。
“Estrus”, but a unique physiological phenomenon of female higher animals. “Chinese Dictionary” “Estrus” Article: “female animals higher before and after the maturation of ovum physiological requirements mating performance.” However, the newspaper male animals frequently “estrus.”