sector

sector
noun

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

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