(IP (PP-LOC (P 在)
(LCP (NP (NN 国际)
(NN 贸易))
(LC 中)))
(PU ，)
(IP-SBJ (NP-SBJ (NN 贸易额))
(VP (VV 有增有减)))
(VP (VC 是)
(NP-OBJ (CP (WHNP-1 (-NONE- *OP*))
(CP (IP (NP-SBJ (-NONE- *T*-1))
(VP (ADVP (AD 经常))
(VP (VV 出现))))
(DEC 的))))))
ARG0: 贸易额
REL: 有增有减