词汇	pitch upward
释义	pitch upward 上仰
随便看	trees to be preserved tree stock tree storage representation trees transformation Trees transplant tree strata tree stratum tree strike treestring tree string structure tree-string structure tree structural system tree structure tree-structure tree structu re tree structure analysis tree structured Tree-structured tree structured architecture tree-structured architecture tree structure database machine tree-structured codebook treestructured computer communication system tree structured database tree-structured diagram