This microscopic cross section of the aorta demonstrates a red blood clot that is compressing the aortic lumen. 镜下主动脉切面中的红色血块表示缩小的主动脉夹层。
When an assumptive cutting plane is passed through an object, the cross section is drawn, which is called a cut. 假想用剖切平面将机件的某处切断，仅画出剖切面与机件接触部分的图形称为断面图，简称断面。
