(IP (ADVP (AD 而))
(NP-SBJ (CP (WHNP-3 (-NONE- *OP*))
(CP (IP (NP-SBJ (-NONE- *T*-3))
(VP (NP-TMP (NT 以往))
(VP (SB 被)
(VP (VV 弃如敝屣)))))
(DEC 的)))
(NP (NN 虾蟹壳)))
(PU ，)
(VP (NP-TMP (NT 如今))
(VP (VRD (VV 提炼)
(VV 出))
(NP-OBJ (PU 「)
(NN 甲壳素)
(PU 」)))))
ARG1: *T*-3
ARGM-TMP: 以往
REL: 弃如敝屣