英文英文字典
英文英文字典
古腾堡计划中的在线英语-英语词典
结果
Vergency的结果
Vergency
(n.)
The act of verging or approaching; tendency; approach.
Vergency
(n.)
The reciprocal of the focal distance of a lens, used as
measure of the divergence or convergence of a pencil of rays.