(IP (ADVP (AD 然而))
(IP-ADV (NP-SBJ (-NONE- *PRO*))
(VP (VRD (VV 推究)
(VV 起来))))
(PU ，)
(NP-SBJ (NN 塑胶)
(CC 和)
(NN 机械))
(VP (ADVP (AD 才))
(VP (VC 是)
(NP-PRD (DNP (NP (PN 他))
(DEG 的))
(ADJP (JJ 老))
(NP (NN 本行))))))
ARG0: *PRO*
REL: 推究