母亲与婴儿的血液在胎盘发生交汇,氧气和营养物质通过脐带进入婴儿体内
%B0%C4%C3%C5%B5%E7%D7%D3%B7%A2%C5%C6%D1%A5%B3%F6%D7%E2%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF
%B0%C4%C3%C5%B5%E7%D7%D3%B7%A2%C5%C6%D1%A5%B3%F6%D7%E2%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF
%B0%C4%C3%C5%B5%E7%D7%D3%B7%A2%C5%C6%D1%A5%B3%F6%D7%E2%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF
%B0%C4%C3%C5%B5%E7%D7%D3%B7%A2%C5%C6%D1%A5%B3%F6%D7%E2%2D%A1%BE%40%31%33%37%31%30%30%37%39%36%38%38%A1%BF




