( (IP (IP (NP-SBJ (-NONE- *pro*))
(VP (VV 估计)
(IP-OBJ (NP-SBJ (-NONE- *pro*))
(VP (VC 是)
(VP (VV 指)
(NP-OBJ (CP (WHNP-1 (-NONE- *OP*))
(CP (IP (NP-SBJ (NN 国内))
(VP (VV 生产)
(NP-OBJ (-NONE- *T*-1))))
(DEC 的)))
(NP (NN 鞋))))))))
(PU ．)
(CP (IP (ADVP (AD 不过))
(LCP-TMP (IP (NP-SBJ (-NONE- *PRO*))
(VP (VV 垫)
(AS 了)
(NP (NN 鞋垫))))
(LC 后))
(PU ，)
(NP-SBJ (DNP (PP (P 对)
(NP (NN 膝)
(NN 关节)))
(DEG 的))
(NP (NN 冲击)))
(VP (VA 小)
(ADVP (AD 多))))
(SP 了))
(PU ．)))
ARG0: *PRO*
ARG1: 鞋垫
REL: 垫