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。
【军】 (军事行动的)地段,分区,防区。
【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。
"late 16th cent. (in senses 2 and 3): from late Latin, a technical use of Latin