n.[C]

1. 【數】扇形；扇形面
2. 【軍】防禦地段；防區；分區
3. 部分；部門
   the private sector of industry

   私營工業部門

4. 函數尺；象限儀
5. 【電腦】段，區段；扇面，扇區

vt.

1. 把……分成部分（或部門等）

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.