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ThelectureforthisclassisaboutthecityofPompeii.Anaturaldisasteroccurredtherealmost2000yearsago.
TodaymanyrichpeoplewholiveinlargemetropolitanareassuchasBeijing,ParisandNewYorkleavethecityinthesummer.Theygotothemountainsortotheseashoretoescapethecitynoiseandheat.
2,000yearsago,wealthyRomansdidthesamething.TheyleftthecityofRomeinthesummer.ManyofthesewealthyRomansspenttheirsummersinthecityofPompeii,abeautifulcity,locatedontheBayofNaples.
Inthesummeroftheyear79C.E.,ayoungRomanboywholaterbecameaveryfamousRomanhistorianwasvisitinghisuncleinP..Theboy’snamewasPlinytheYounger.OnedayPlinywaslookingupatthesky.Hesawafrighteningsight.Itwasaverylargedarkcloud.Thisblackcloudrosehighintothesky.WhatPlinysawwastheeruptionofthevolcanocalledMountVesuvius.Rockandashflewthroughtheair.ThecityofP.wasatthefootofMt.V..Whenthevolcanofirsterupted,manypeoplewereabletogetoutofthecityandtoescapedeath.Infact,18,000peopleescapedtheterribledisaster.Unfortunately,therewasnotenoughtimeforeveryonetoescape.Morethan2,000peopledied.Theseunluckypeoplewereburiedaliveunderthevolcanicash.Theeruptionlastedforabout3days.Whentheeruptionwasover,P.wasburiedunder20feetofvolcanicrockandash.ThecityofP.wasforgottenforalmost1,700years.
Intheyearof1748anItalianfarmerwasdiggingonhisfarm.Ashewasdigging,heuncoveredapartofawalloftheancientcityofP..Soonarchaeologistsbegantodiginthearea.Astimewentby,muchoftheancientcityofP.wasuncovered.TodaytouristscomefromallovertheworldtoseetheruinsofthefamouscityofPompeii.
Lesson4RollerCoaster
Let'
stalkaboutthephysicsinvolvedinarideonarollercoaster.I'
msuremanyofyouhavetakenarideonarollercoaster.Asimplerollercoasterconsistsofaframewithatrackonit.Thetrackisverymuchlikeatraintrack,thistrackgoesoveraseriesofhillsandaroundcurves.Itfollowsapaththatendsatthesameplaceitstarted.Atrainofcarstravelsaroundonthistrack,veryfast.Thecarshavetwosetsofwheels.Onesetofwheelsrollsontopofthetrack,andtheotherssetofwheelsrollsbelowthetrack.Thewheelsbelowthetrackkeepthefastmovingcarsfromcomingoffthetrack,rollercoastercarsasyouprobablyknowdon'
thaveanymotorsorengines.Instead,achainpullsthecarsupthefirst,tallestandsteepystaffhill,thisishowtheridebegins.Then,atthetopofthehillthechaincomesoffthecarsandgravitytakesover.gravitypushesthecarsdowntheothersideofthehill.thetallerandsteeperthefirsthillis,thefastertheridewillbe.Andthefartherthecarswilltravel.asthecarsrolleddownhilltheygainedspeed.thecarshaveenoughspeedandenergytosendthemupthenexthill.asthecarsnearthetopofthesecondhilltheybegintoslowdown.butthen,thecarsreachedthetopofthathill,andstartdowntheotherside.gravityagainpushesthemtowardtheground.thisprocessrepeatsoneachhale.Okay,solet'
sgooverthisprocessagain.first,thecarsarepulledbyachainupthefirsthighesthill.thentheygodownaverysteepslope,atthispoint,thereisenoughenergytopullthecarsupandoverthenexthill.whentheyreachedthebottomofthathill,thereisenoughenergytoclimbthenexthill,therollercoastercarsloseenergyastheridecontinues.so,thehillshavetobesmallertowardtheendofthetrack,finallywerolltoastopongroundlevelrightwherewebegan.
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Lesson5Language:
HowChildrenAcquireTheirs
WhatI’dlietotalktoyouabouttodayisthetopicofchildlanguagedevelopment.Iknowthatyouallaretryingtodevelopasecondlanguage,butforamoment,let’sthinkaboutarelatedtopic,andthatis:
Howchildrendeveloptheirfirstlanguage.
Whatdoweknowabouthowbabiesdeveloptheirlanguageandcommunicationability?
Well,weknowbabiesareabletocommunicateassoonastheyareborn,evenbeforetheylearntospeaktheirfirstlanguage.Atfirst,theycommunicatebycrying.Thiscryingletstheirparentsknowwhentheyarehungry,orunhappy,oruncomfortable.However,theysoonbegintheprocessofacquiringtheirlanguage.Thefirststateoflanguageacquisitionbeginsjustafewweeksafterbirth.Atthisstage,babiesstarttomakecooingnoiseswhentheyarehappy.Then,aroundfourmonthsofagetheybegintobabble.Babiesallovertheworldbegintobabblearoundthesameage,andtheyallbegintomakethesamekindsofbabblingnoises.Now,bythetimetheyaretenmonthsold,however,thebabblingofbabiesfromdifferentlanguagebackgroundssoundsdifferent.Forexample,thebabblingofababyinaChinese-speakinghomesoundsdifferentfromthebabblingofababyinanEnglish-speakinghome.Babiesbeginanewstageoflanguagedevelopmentwhentheybegintospeaktheirfirstwords.Atfirst,theyinventtheirownwordsforthings.Forexample,ababyinanEnglish-speakinghomemaysay―baba‖fortheword―bottle‖or―kiki‖for―cat.‖Inthenextfewmonths,babieswillacquirealotofwords.Thesewordsareusuallythenamesofthingsthatareinthebaby’senvironment,wordsforfoodortoys,forexample.Theywillbegintousethesewordstocommunicatewithothers.Forexample,ifababyholdsupanemptyjuicebottleandthensays―juice,‖tohisfather,thebabyseemstobesaying,―Iwantmorejuice,Daddy‖or―MayIhavemorejuice,Daddy?
‖Thisword―juice‖isreallyaone-wordsentence.
Now,thenextstageoflanguageacquisitionbeginsaroundtheageof18months,whenthebabiesbegintosaytwo-wordsentences.Theybegintouseakindofgrammartoputthesewordstogether.Thespeechtheyproduceiscalled―telegraphic‖speechbecausethebabiesomitallbutthemostessentialwords.AnEnglish-speakingchildmightsaysomethinglike―Daddy,up‖whichactuallycouldmean―Daddy,pickmeup,please.‖Then,betweentwoandthreeyearsofage,youngchildrenbegintolearnmoreandmoregrammar.Forexample,theybegintousethepasttenseofverbs.Thechildrenbegintosaythingssuchas―Iwalkedhome‖and―IkissedMommy.‖Theyalsobegintoovergeneralizethisnewgrammarruleandmakealogofgrammarmistakes.Forexample,childrenoftensaysuchthinsas―Igoedtobed‖insteadof―Iwenttobed,‖or―Ieatedicecream‖insteadof―Iateicecream.‖Inotherwords,thechildrenhavelearnedthepasttenseruleforregularverbssuchas―walk‖and―kiss,‖buttheyhaven’tlearnedthattheycannotusethisruleforallverbs.Someverbslike―eat‖areirregular,andthepasttenseformsforirregularverbsmustbelearnedindividually.Anyway,thesemistakesarenormal,andthechildrenwillsoonlearntousethepasttenseforregularandirregularverbscorrectly.Thechildrenthencontinuetolearnothergrammaticalstructuresinthesameway.
Ifwestoptothinkaboutit,actuallyit’squiteamazinghowquicklybabiesandchildrenallovertheworldlearntheirlanguageandhowsimilartheprocessisforbabiesallovertheworld.
Doyourememberanythingabouthowyoulearnedyourfirstlanguageduringtheearlyyearsofyourlife?
Thinkabouttheprocessforaminute.Whatwasyourfirstword?
Wasit―mama‖ormaybe―papa‖?
NowthinkalsoabouttheprocessoflearningEnglishasasecondlanguage.CanyourememberthefirstwordyoulearnedinEnglish?
Idoubtthatitwas―mama.‖Now,thinkaboutsomeofthesimilaritiesanddifferencesinvolvedintheprocessesofchildandadultlanguagelearning.We’lltalkaboutsomesimilaritiesanddifferencesinthefirstandsecondlanguagelearningprocessestomorrow.Seeyouthen.
Lesson7Robots
When
people
think
about
a
robot,
they
often
picture
machine
that
looks
something
like
human
being.
However,
that’s
not
always
the
case.
Most
robots
do
look
much
being
at
all,
machines
because
what
most
of
them
are-
industrial
machines.
Today,
I’m
going
to
talk
mostly
used
in
industry.
The