举个例子 ·对于生成式 1)SCI_TITLE_X deconstructing SCI_THING SCI_TITLE_POSTFIX 。2)SCI THING SCI_THING_P 。3)SCI THING P suffix trees 。4)SCI TITLE_POSTFIX using SYSNAME 。5)SYSNAME singular value decomposition 尝试规约 deconstructing suffix trees using singular value decomposition 。I)→规约掉deconstructing ·SCI THING→suffix trees;完成 SCI_TITLE_POSTFIX-using singular value decomposition 。4)→规约掉using SYSNAME singular value decomposition;完成 举个例子  对于生成式 ◦ 1）SCI_TITLE_X deconstructing SCI_THING SCI_TITLE_POSTFIX ◦ 2）SCI_THING SCI_THING_P ◦ 3）SCI_THING_P suffix trees ◦ 4）SCI_TITLE_POSTFIX using SYSNAME ◦ 5）SYSNAME singular value decomposition  尝试规约 ◦ deconstructing suffix trees using singular value decomposition ◦ 1) →规约掉deconstructing  SCI_THING → suffix trees; 完成  SCI_TITLE_POSTFIX → using singular value decomposition ◦ 4） →规约掉using  SYSNAME singular value decomposition; 完成