1Mechanics and Geometry a line about which the moment of a given torque is zero.
2Physics a line in space–time representing the path of a light ray, on which any two points have zero interval.
Mid 19th century.
英汉双解词典包含464360条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。