英语科技手抄报内容关于科技的,给些英文材料,

1.Whythestarswillflashflashit?

　　Weseestarssparkle,thisisnotbecausethestarschangetheirbrightness,butwiththeatmosphere,blockingthe.

　　Acrosstheatmospherebetweenusandthestars,whenthestarlightthroughtheatmosphere,theywillreceivetheimpactofatmosphericdensityandthickness.Theatmosphereisnotabsolutelytransparent,itstransparencywillbedifferentaccordingtothedensitydifference.Therefore,welookatthestarsonthegroundthroughit,you'llseethestarsasifflashingthesameagain.

　　2.Whydopeopleyawn?

　　Whenwefeeltired,thebodyhasgeneratedalotofcarbondioxide.Whentheexcessofcarbondioxide,itisimportanttoincreasetheoxygenneededtobalancethebody.Becausetheseresidualcarbondioxide,wouldaffectthefunctioningofourbodyactivity,thenthebodywillissueaprotectiveresponse,soeonplayingyawn.

　　Yawningisakindofdeepbreathingmovements,itmakesusmorethanusual,suckedintooxygenandemitcarbondioxide,butalsodoittoeliminatetheroleoffatigue.

　　3.Whyaresnakesabletowalkwithoutfeet?

　　Thesnake'sbodytherearemanyscales,whichistheoutermostlayeroftheirbodyarmor.Scaleisnotonlyusedtoprotectthebody,canalsobetheirfeet.

　　Snakecrawlingforward,thebodywillbeshowedS-shaped.AndeveryoneintheS-shapedoutsideofthescaleswilltilttohelpthesnakemoveforwardtoseizetheunevenroadsurface.Thescaleofmuscleco-ordinationwiththesnake,andcanpushthebodyforwardincrawling,sothesnakecanmovewithoutlegs呀!

　　4.Whydosunflowersbloomisalwaystowardthesun,

　　Sunflowerchrysanthemumstemsthefollowingplaces,containssomethingcalledplantgrowthhormone,substances.Thismaterialisacceleratingfunctionofreproduction,butithasarepulsiveopticalactivity,whenconfrontedwiththelight,theywillgotothebacklightside.

　　Therefore,whenthesunrises,sunflowerstemswillimmediatelyhidebacklightsidetogoonthewholeplantlookstowardthedirectionofthesunwasbent.

　　5.Whydoesapersonoldhairwillbewhite?

　　Ourhairhadsomethingcalledmelanininsubstance,themoremelaninthemoreblackhaircolor.Themelanin***all,yelloworwhitehairwillbeissued.Humansinoldage,thebody'svariousfunctionswillgraduallydecline,pigmentformationwillbelessandless,sothehairwillgraduallybeewhiteah!

　　6.WhyisFireflywillshine?

　　Fireflywillbelightbecauseintheendoftheirabdomenarelight-emittingdevices,light-emittingdevicefilledwithanumberofqualityandlight-emittinglight-emittingphosphorus-containingenzymes,sothatcanbeissuedaflashoffirefliesflashoflight.

　　Thepurposeoffireflylight,inadditiontolighting,therearemating,warning,trappingandsoon.Thisisalsoamunicationtoolforthem,differenttypesoffireflieslight-emittingmeansemittingfrequencyandthecolorwillbedifferent,theyliketotakethistoconveyadifferentmessage.

　　7.Whyarehungrywillcluckcall?

　　Shewashungryandrollingwillbecalled,itisbecausethefoodpriortoeatingfasttodigestfinished,althoughtheemptystomach,butwillcontinuetosecretegastricjuicethestomach.Atthistimethecontractionofthestomachwillgraduallyexpandinsidetheliquidandgaswillbewellingup,resultinginrollingsound.

　　Nexttimeshouldnolongerstomachtheembarras***entofcuckoocalledah!Becausethisisanormalphysiologicalactionsdo.

　　8.Whydoesanostrichdoesnotfly?

　　Bodytypeofalargeostrichclass,buttheydonotflyoverhead,andah!Thisisnotbecausetheirwingsdonotwork,buttheirfeathersaretoosoft,wingstoo***all,notfitforflying.Inaddition,theostrichmusclesdeveloped,sternumflatagain,andontheflightdidnothelp.

　　OstrichesliveinAfrica,duetothelonglivingindesertareas,thebodyinordertoadapttotheenvironment,theygraduallyevolvedintowhatitis.

　　9.Whyisnotperishableandcannedfoodinside?

　　Luncheonmeat,lobstersaucedace,tomatosauce,cannedbeans.aredeliciousfood,theycanbestoredforalongtimearenoteasilydeteriorate.Thisisbecausecannedfoodissealed,thebacteriacannotenter.

　　Peopleinthemanufactureofcannedfood,whenthecannedairinallout,andthensealit.Intheabsenceofaircase,evenifsomebacteriainsidethefoodfrombeingcontaminated,theycannotsurviveorbreedah!

10.Whydidthebabywillbebornjustbeencrying?

　　Whenyouaremakingallsortsofnewbornbabiescry,notbecausetheyfeelunhappy,buttheyarethefirstportDakoutaikoutobreathetheairit!

　　Whenthebabytoleavehermotheratbirththebody,theysucktheairintothefirstportwillbeuptothethroat,whichwillviolentlyhitvocalcords,sothatvocalcordsvibration,andthenissuedasimilarcryingsound.

　　11.Whyisthetailoflizardsareconstantlybouncingoffbehindthat?

　　Inordertoprotectthemselves,manyofXiTangalsofacilitateprotectivecoloringdeceivethepublic;whilesomelizardswhenattacked,thetailwillbearesultofintensemusclecontractioncausedbybrokendown.Basedonthetailbrokenofftherearestillpartofthenerveisalive,itwillcontinuetobounce,thusdispersedtheenemy'sattentioninordertoescape.Donotthinkthattheendoftheirlivesso,infact,justafewmonths,thetailwillgrowbackandcontinuetolive.

　　12.Whyisthesquirrel'stailparticularlylarge?

　　Donotlookrelaxedrattail!Squirrelsjumpinginthetrees,whileitstailisplayingaveryusefulrole.Itcanmakesquirrelsinthetreesbebalancedwhenjumpingtoavoidfallinginjuries.Inaddition,thistailsignificantlybetterinthewinter,thefunctionoftheprotective,tightlyaroundthesquirrel'sbody,bothconvenientandpractical.

　　13.Whydoesaperson'sthumbcannothaveoneorthree?

　　Mostpeoplehavefivefingers,whilethelengthofthefingersaredifferent.However,thereisnoonenoticedthatinadditiontothethumb,otherfingershavethree,whileonlytwothumbsalonedo?Theoriginal,itisinlinewiththeotherfoursessionsmeans.Ifthree,thenthethumbwouldappearthereisnopowerthatitcannotbringheavyobjects;ifonlyone,itcannoteasilywiththeotherfourfingerswiththegraspthings!

　　14.WhywasnotIdonotfeelitchyandscratchingyourself?

　　Assomeonescratchtheirown,wewillfeelitchy,andkeptlaughing;However,whenscratchinghisowntime,notonlydowenotlaugh,butalsodonotfeelitchy.Basedonourmindshavebeenprepared,thebrainwillbeissuedanodangermessage,nerveshasalsoetorelax,sotheywillnotlaughandfeelitchyin!

　　15.Whyisseawateraremostlyblue,green?

　　Looktothesea,inmanyalsofoundthatwatershowedblue,green.However,whenyoupickedupthewater,youcanonlyseeitliketheolddaysofwater-like,transparentcolorless.Theoriginal,theseaitself,withourdailyeintocontactwithwater,therearenomajordifferenceistransparent.Wehaveseenthegreen,infact,isthewaterabsorptioncapacityoflightarisingoutofthephenomenon.Onlygreenwatercanbeabsorbed,andthusreflectedout;asdeeperwater,thegreenlightwasabsorbed,thesealooksbecameblue.

　　16.Whygoosebumps?

　　Ourskinlongwithfinehair,andeachonehasanerectionunderthehairporemuscle,whenthesubjectnervestimulation(forexample:anger,fear,cold,etc.),thebodytemperaturewilldecline,whiletheverticalhairmusclecontractionwillbethusmakinghairerectedtoformagoosebumps.Inadditiontotherolewithinsulation,suchaphysiologicalbodysystemwouldalsomaketheanimalsmorethanitactuallyseemstodetertheenemy.

　　17.Hippocampalwhichgoesbythefather'sbirth?

　　Almostallanimalsarealsothenextgenerationoffemalereproduction,butthehippocampusisdifferent,itisoutbyamalebirth.InthemalehippocampushasabellylikeaKangarooparentingbagbagofthehatchery,thefemalemaleHippocampushippocampuswillroutedtothehatcheryeggsacs.Afterthemalehippocampusontotakeuptheresponsibilityofbreeding,afteraboutthreeweeks,the***allhippocampuswouldpopupfromhisfather'sbody.

　　18.Whyaretheleaveschangedcolor?

　　Theleaveschangecolorbecauseofitsinherentchemicalsubstances-chlorophyllrelated.Whenautumnes,thetimeduringthedayisshorterthanthatinthesummer,buttemperaturesarerelativelylow,theleavesstopmanufacturingchlorophyll,therefore,theremainingnutrientstransportedtothestorageoftrunksandroots.Thegreenleavesintheabsenceofchlorophyll,atthesametime,otherchemicalpigmentsandthusapparent,sowecanseemorecolorssuchasyellowandbrownleaves.

　　19.Whyarethereleaves?

　　Autumnisingwhentheleavesontheevaporationofmoisturemorethanthesummer,buttherootsarelessabsorbentthanthesummer.Inordertoreducethemoisturelossoftrees,thestemcellsbegantoformaseparatelayer,tobepletelydetachedfromtheleavesofnutrients,theseparationlayerwillseparatetheleavesandtreetrunks,leavestofalloff.

　　20.Whydidthewhalewillspray?

　　Whalesaremammalsone,butitdoesnotnoseshellnose,noselengthinthehead.Itlivesinwaterbreathingwiththelungs,cansavealotofone-offair,donotoftengotothesurfaceventilation.Butwhenitestothesurfaceofthewaterventilation,itwillbeusedfornasalbreathing,whilebreathinginvitroassociatedwatersprayisissuedbythegiantwavecausedbythepressure.