(IP (NP-SBJ (PN 双方)) (VP (VP (VP-FOC (VV 争议)) (VP (ADVP (AD 不)) (VP (VV 下)))) (PU ,) (VP (ADVP (AD 难)) (VP (VV 定) (NP-OBJ (QP (CD 一)) (NP (NN 尊))))))) arg0: 双方