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pencil of rays
meaning in English
光线束,光线锥
光锥
Examples
Convergent
pencil of rays
会聚光线束
Related Words
pencil
headache pencil
pencil bag
eyebrow pencils
central pencil
pencil tube
cuof pencils
pencil slate
pencil sketch
caustic pencil
pencil of quadratic curves
pencil of quadric hypersurfaces
pencil of spheres
pencil of x rays
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