n.部门；领域；防御地区；扇形 变形： 复数：sectors 双语释义：n.(名词)[C] 部门; 领域 part or branch of a particular area of activity, especially of a country's economy[C] 防御地区,防卫区域 any of the parts of a battle area, or of an area under military control[C] 扇形,扇形面 part of a circle lying b