Results In normal fetus, the urorectal septum ( URS ) descended, its distance to cloacal membrane decreased gradually.结果 泄殖腔发育过程中,胎龄15d前 的正常鼠胚, 尿直肠隔将 泄殖腔 分为腹侧的尿生殖窦和背侧的直肠两部分, 二者共同相通于泄殖腔管....
‘He’s a politician, remember.’ ‘Enough said.’“别忘了，他是个政客。”“不用多说了。”The experienced politician disposed of the attack in a few minutes.这个富有经验的政治家几分钟内就挫败了这一进攻。That politician is insatiable for power.那个政客对权力贪得无厌。A politician ...