portion: n.1.一部分。2.一份，一般；(饭菜)一客。3.【法律】分得的财产。4.嫁妆，妆奁。5.〔仅用单数〕命运。短语和例子one portion of roast beef 烤牛肉一客。 a portion of (land) 一部分地，若干(土地)。vt.1.把…分成份额；分配 (out)。2.给…嫁妆。3.命运注定。adj.-less 得不到分配物的〔尤指遗产〕的；没有嫁资
This model facilitates the medical students to get a correct understanding of the external features of the brain and its arterial supply as a whole , as well as the relations between their component portions 本模型适用于医学院校在讲解脑与脑血管课程时作直观教具用，便于学生了解脑和它的动脉供应的整体概念，以及各部分的相互关系。
