单词	radius vector
释义	radius vector noun 1 a : the line segment or its length from a fixed point to a variable point b : the linear polar coordinate of a variable point 2 : a straight line joining the center of an attracting body (such as the sun) with that of a body (such as a planet) in orbit around it Word History First Known Use 1740, in the meaning defined at sense 2
随便看	ectropions ectropiums ectropyes ectropys ects ectypal ectype ectypes ecu Ecua Ecuador ecuadoran ecuadorans ecuadorean ecuadoreans ecuadores ecuadorian ecuadorians ecuadors ecuelle ecuelles ecumene ecumenic ecumenical ecumenical patriarch

英语词典包含469781条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。