这一区分的某些原因可简单陈述如下.Some of the reasons for this distinction can be briefly stated.存在许多可以截然区分的变种.Many varieties existed which differed from one another in clear - cut ways.他们是全同的和不可区分的.They are identical and indistinguishab...
Methods Endoscopic observation and mucosal biopsies graft through the terminal ileum enterostomy were carried out.方法自末端回肠肠造口行内镜检查,观察肠粘膜变化并钳取肠粘膜组织做病理学检查....