简介：<正>Melville’sNoby-Dickissuchagreatbookthatisfullofsymbols,suggestingendlessmeanings,Ithink,thesymbolofwhitenessis,amongotherthings,adominantone.Asweknow,thecolorwhite,likeathickthread,goesthroughthewholebookfromtheopeningchapter,whenIshmaeldreamsthewhale“onegrandhoodedphantom,likeasnowhillintheair”totheconcludingepilogue,whenthewhalingshipdisap-pearsina“crearmypool”.Sowhitenessisakeywordtoap-proachthemysteryofthebook.ManycriticsbelievethatMobyDickisthedominantsymbolofall.Iagree,forMobyDickandwhiteness,Ias-sume,arereallytwoinseparableaspectsofonething:oneisthephysicalformofwhiteness,theotheristhespiritualsoulofthephysicalbodyofthewhale,Inotherwords,MobyDickisthepersonificationofwhiteness.So,whenItalkabouttheabstractcolorofwhiteness,Iamstressingthesuperficialchar-acterofMobyDickinsteadofaphysicalanalysisofhim.Then,whatdoeswhitenesssymbolize?Diffe

简介：目的比较研究Dick氏钉内固定后矫形丢失情况。方法对使用Dick氏钉、AF钉治疗胸腰椎骨折脱位52例随访对照分析。结果用Dick氏钉钉内同定组，由于万向关节的松动，远期手术矫正有明显丢失。结论AF系统与Dick氏钉相比结构更简单，使内植物住具备复位、固定功能的同时操作方便、有效。

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简介：总结角度Dick系统在治疗爆炸型骨折中对恢复椎体高度和椎管容积的作用,以能够恢复骨折椎体的高度和椎管的容积,角度Dick由于其有向上下撑开的一定角度和自身椎弓根钉的增强性使脊椎能够在术中复位时使脊柱纠正并销毁不利的后突畸形