| 单词 | sector |
| 释义 | sector n. 1. a distinct part or branch of an enterprise, or of society, the economy, etc. 2. Mil. a subdivision of an area for military operations, controlled by one commander or headquarters. 3. the plane figure enclosed by two radii of a circle, ellipse, etc., and the arc between them. 4. a mathematical instrument consisting of two arms hinged at one end and marked with sines, tangents, etc., for making diagrams etc. Derivatives sectoral adj. Etymology: LL, techn. use of L sector cutter (as SECTION) |
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