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1. Oxford American Dictionary

   estrus

   • IPA[ˈestrəs]

   美式

   • n.
     a recurring period of sexual receptivity and fertility in many female mammals; heat

   • noun: oestrus

2. • 釋義

   n.

   名詞

   • 1. a recurring period of sexual receptivity and fertility in many female mammals; heat a mare in estrus