therowofsmallbonesthatareconnectedtogetherdownthemiddleoftheback脊柱;脊椎SYNbackboneanyofthesharppointedpartslikeneedlesonsomeplantsandanimals(植物的)刺;(动物的)刺毛◆Porcupinesusetheirspinestoprotectthemselves. 豪猪用身上的刺毛来自卫。➡ see alsospinythenarrowpartofthecoverofabookthatthepagesarejoinedto书脊