(CP (IP (NP-SBJ (-NONE- *pro*)) (VP (ADVP (AD 无法) ) (VP (VV 逾越) (NP-OBJ (-NONE- *T*-2))) ) ) (DEC 的) )) (NP (NN 难关) ) ) ) arg0: *pro* argm: 无法 arg1: *T*-2 难关