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The placenta is what keeps the calf alive during pregnancy. Directly connected to the mother's blood supply, it funnels nutrients and oxygen straight into the calf's body via the umbilical c..2017-06-12 编辑：max
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研究表明，孕妇吸入的有毒烟尘颗粒在她们的子宫里被发现，而这很有可能会伤害正在发育的胎儿。2018-09-28 编辑：max
