以下为句子列表:
英文: Proestrus: The female attracts males, has a bloody vaginal discharge and her vulva is swollen. Proestrus lasts approximately nine days; the female, however, will not allow coitus at this time.
中文: 发情前期:母犬开始引诱公犬,阴道有血渗出,阴户涨大。发情前期约持续九天,不过,这段时间,母犬并不与公犬交配。
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