n.[C]

1. 【数】扇形；扇形面
2. 【军】防御地段；防区；分区
3. 部分；部门
   the private sector of industry

   私营工业部门

4. 函数尺；象限仪
5. 【电脑】段，区段；扇面，扇区

vt.

1. 把……分成部分（或部门等）

n.

1. an area or portion that is distinct from others.
   ▸a distinct part of an economy, society, or sphere of activity.
   ▸a subdivision of an area for military operations.
2. the plane figure enclosed by two radii of a circle or ellipse and the arc between them.
3. a mathematical instrument consisting of two arms hinged at one end and marked with sines, tangents, etc. for making diagrams.