an area or portion that is distinct from others 区域;部分 ■a distinct part or branch of a nation's economy or society or of a sphere of activity such as education (国家经济,社会等活动的)部门 ■(Military)a subdivision of an area for military operations (军)战区,防区 ■(Computing)a subdivision of a track on a magnetic disk (计算机)(磁盘上的)扇区
the plane figure enclosed by two radii of a circle or ellipse and the arc between them 扇形
a mathematical instrument consisting of two arms hinged at one end and marked with sines, tangents, etc. for making diagrams 函数尺,象限仪
派生 sectoral adjective 语源
late 16th cent. (in senses 2 and 3 ): from late Latin, a technical use of Latin sector 'cutter', from sect- 'cut off', from the verb secare