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我也不懂啊,随便猜猜 * }9 _7 z% N( E1)母亲给胎儿的营养不是通过脐带传的吗? 5 n/ C. `4 E' I2)据说,鲜血是红色的,因为带来大量氧气和营养成分,而废血是暗色的,月经的血就是暗色的! h) \( G C9 L; C
3)我记得月经的血就是冲走子宫粘膜什么的,所以是废血。4 o2 G; k7 R1 A
4)否则你想啊,每次月经你留出去的都是鲜血,那多可怕啊?!
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I hope you mean tubal sterilization or neuter. ' N3 O9 o, s; R: U- x* |% f/ zWhy would anybody want woman's exhausted or clotted blood in his/her body?