一、肚脐是脐带残端的“遗迹”
要说肚脐是怎么形成的,
%B0%FC%DA%41%EB%8A%D7%D3%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%FC%DA%41%EB%8A%D7%D3%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%FC%DA%41%EB%8A%D7%D3%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%FC%DA%41%EB%8A%D7%D3%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%FC%DA%41%EB%8A%D7%D3%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%FC%DA%41%EB%8A%D7%D3%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%FC%DA%41%EB%8A%D7%D3%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




