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	muddle muddle along muddle through muddle-minded muddlebrained muddled muddled along muddled through muddledness muddledom muddlehead muddleheaded muddleheadedly muddleheadedness muddleheadednesses muddleheads muddlement muddler muddlers muddles muddles along muddles through muddling muddling along muddling through

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