pencil of lines
短语词组
- pencil l of lines 线束
- perspective pencil of lines 透视线束
- pencil of qavallel lines 平行直线束
- a pencil of lines 线束
- pencil of parallel lines [数]平行线束;并行线束
- pencil of central lines 中心直线束
- pencil of straight lines 直线束
- harmonic pencil of lines [数]调和线束 返回 pencil of lines