Awolfchildisahumanchildcompletelybroughtupbywolvesorotheranimalsandlivedisolatedfromhumancontactfromaveryyoungage.

　　Veryfewcasesofwolfchildrenhavebeenreported.In1920,twowolfgirlswerediscoveredinaforestinIndia,bothofwhomappearedtohavebeenbroughtupfrombirthbywolves.Theyweretakentoanorphanageandthestruggleto"humanisetheanimals"began.Theywouldnotallowthemselvestobedressed,scratchedandbitpeoplewhotriedtofeedthem,rejectedcookedfoodandwentonallfours.Theydidnotspeak.Oneofthegirlsdiedin1921.Anothergirl,whowaseight,surviveduntil1929,onlyinherlatteryearsbeginningtostandup,relatetootherhumans,andspeakafewwords.

　　Wecanseefromtheabovecaseandothercasesthatawolfchildusuallyhasnoorlittleexperienceofhumancare,lovingorsocialbehavior,and,crucially,ofhumanlanguage.Childrenwithsomehumanexperiencebeforeisolationaremoreeasilyrehabilitated.Childrenwholearnananimalcultureduringthefirstfiveorsixyearsoflife,finditalmostimpossibletolearnhumanlanguage,evenafterintensiveandlovingcareforyears.

　　Oneofthereasonsisthatawolfchildishardlygrowingupinanurturingenvironment,andthatthelackoflanguageacquisitioninlaterlifemaybeduetotheresultsofagenerallyabusiveenvironmentratherthanbeingspecificallyduetoalackofexposuretolanguage.

　　Anotherpossiblereasonisthattheremaybeacriticalperiodforlanguageacquisition,assomeoneargues.Criticalperiodsaretimeframesduringwhichenvironmentalexposureisneededtostimulateaninnatetrait.Youngchaffinches,forexample,musthearthesongofanadultchaffinchbeforereachingmaturity,orelsewouldneverbeabletosing.Ifacriticalperiodforlanguageacquisitiondoesexist,andifnolanguageislearnedbeforetheexpiryofthecriticalperiod,itcouldneverbelearnedinanormalandfullyfunctionalsense.

　　What’smore,whenwolfchildrenarediscovered,theytendtobecomethesubjectoflivelyscientificandmediainterest.Oncetheexcitementdiesdownandtheirlimitationsintermsoflearninglanguageandcultureandsocialbehaviourbecomeobvious,frustrationcansetinandtheyoftenspendtherestoftheirlivesbeingpassedfromonecaregivertoanother.

　　花了很长时间,虽然没到800字,但我尽力了,