(NP (NP (NT 当今))
(CP (WHNP-3 (-NONE- *OP*))
(CP (IP (NP-TPC (-NONE- *T*-3))
(NP-SBJ (NN 争论))
(VP (VV 持久)))
(DEC 的)))
(DNP (NP (NN 鸟类)
(NN 起源))
(DEG 的))
(DP (DT 各)
(CLP (M 种)))
(NP (NN 假说)))
ARG0-PSR: *T*-3
ARG0-PSE: 争论
REL: 持久