单词	sector
释义	sector A sector of a circle, with centre O, is the region bounded by an arc AB of the circle and the two radii OA and OB. The area of a sector is equal to , where r is the radius and θ is the angle in radians.
随便看	elliptic geometry elliptic integral elliptic paraboloid elliptic partial differential equation elliptic plane embedding empirical empirical probability empty set emv emv algorithm En encrypt End endomorphism end‐point energy energy equation enneagon entering variable entire function entropy entry Entscheidungsproblem enumerable

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