n. 分区；部门；扇区数（sector的复数）

n a plane figure bounded by two radii and the included arc of a circle

n a social group that forms part of the society or the economy

n a particular aspect of life or activity

n the minimum track length that can be assigned to store information; unless otherwise specified a sector of data consists of 512 bytes

n a portion of a military position

n measuring instrument consisting of two graduated arms hinged at one end