惯性系 guànxìngxì inertial frame Origin Definitions Defs Strokes Stroke Words Sentences Sents 惯性 慣性 guànxìng inertia the property of an object to remain at rest or keep moving in a straight line unless acted upon by an outside force系 xì nounnumeral system (general) (bound form) a group of related things that form a whole; series; family