(NP-OBJ (CP (WHNP-2 (-NONE- *OP*)) (CP (IP (NP-SBJ (-NONE- *T*-2)) (VP (ADVP (AD 难以)) (VP (VV 估量)))) (DEC 的))) (NP (NN 损失)))
ARG1: *T*-2 ARGM-ADV: 难以 REL: 估量