难解难分

难解难分 [nán jiě nán fēn]

1. ■ （双方相持不下） be inextricably involved (in a dispute); be locked together (in a struggle); neither would give in; neither can get the upper hand:

两军厮杀，难解难分。 The two opposing armies are locked in battle.

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常用词组

1. ■ （关系密切）be sentimentally attached to each other;cannot bear to part with each other:

把他们结合起来的力量越来越强， 这就使得他们难解难分了。 What unites them is becoming stronger and stronger and is making them wellnigh inseparable.