[ C ] a deep, narrow mark made in soft ground especially by a wheel(在松软地面上压出的)沟,凹痕;(尤指)车辙
[ S ] the period of the year during which particular male animals, especially deer and sheep, are sexually active(尤指雄鹿、公羊等的)发情期
(of particular male animals) sexually excited(雄性动物)发情
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