保长对应 Traditional 保長對應 bǎo cháng duì yìng 🔊 distance-preserving correspondence + Review this word Meanings bǎo cháng duì yìng 保長對應 (math.) distance-preserving correspondenceisometry Its characters 保bǎoto defend; to protect; to keepHSK 5长zhǎngchiefHSK 2对duìright; correctHSK 1应yīngto agree (to do sth)HSK 7–9