难解难分（難解難分）　

◎ 难解难分，难分难解 nánjiě-nánfēn,nánfēn-nánjiě

(1) [be inextricably involved]∶形容争斗的双方实力相当,胜负未决,难分高下

(2) [be sentimentally attached to each other]∶也形容情意绵绵,情感深厚,难以分离