三体问题 sāntǐwèntí three-body problem Origin Definitions Defs Strokes Stroke Words Sentences Sents 三体 三體 sāntǐ three-body relating to the three-body problem in physics, which involves predicting the motion of three point masses under their mutual gravitational force问题 問題 wèntí noun issue a matter, topic, or difficulty needing resolution or research