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1、NewInternationalBusinessEnglish
Unit12Processesandoperations
12.1Howdoeshework?C
Listentothisconversation.
Questioner:Sohowdoesaphotocopierwork?
Explainer:Well,basicallytheyworkontheprincipleofelectricalcharges.Modernphotocopiersmakeuseofstaticelectricity-noinkisinvolved,asitusedtobe.
Questio
2、ner:Well,howdothemarksgetontothepaper?
Explainer:Well,ifyouopenuptheinsideofthephotocopierunderneathwhereyoulaythesheetofpaperyouwantcopying,you'llsee...ooh,you'llseealotofthingsgoingon.
Questioner:Well,whatactuallyhappenswhenyoupressthestartbutton?
Explainer:well,there'sadrum,whichisspeciall
3、ycoatedwithamaterialwhichconductselectricitywhenlightshinesonit.Thisdrumturnsaround.Firstit'sgivenanegativestaticelectriccharge.That'sveryimportant.
Questioner:Whatdoesthelightdo?
Explainer:Well,yousee,atthesametimeasthedrumisbeingcharged,youroriginalwhichyou'velaidfacedownovertheglasstopisex
4、posedalittleatatimetoalightwhichmovesoverthedocument.Thisimageisprojectedontothedrumasitrevolvesandtheelectrostaticchargedestroysthelight.
Questioner:Right.But...umyousaidthattheimage,orprintedmaterial,thatitnolingercomesfromink,asitusedto,sohowdothemarksgetontothepaper?
Explainer:Mhm.Yeah,we
5、llbeforethatcanhappentonerpowerwhichisnegativelychargedisdustedorbrushedontothedrum.Anditisattractedtothechargedpartsonthedrum.Thatisthetonerstickstothoseparts.Andthosearethemarksonthedocument,thatis,thepartsthathavekepttheirel...theirstaticelectriccharge.
Questioner:Right.Yup.
Explainer:Andw
6、...afterthatcomesthetransferstage.Thesheetofcopypaperispositivelycharged.Andinthiswayitattractsthetoner.
Questioner:Andisthatwhenitactuallycomesoutofthephotocopier?
Explainer:That'sright.
Questioner:Butwhy'sthepaperhotwhenitconesoutofthemachine?
Explainer:Ah,well.
12.2WhatdoIhavetodo?A
You'll
7、hearthreeconversations.Here'sthefirst.
Woman:OK,Bob.Sofirstofall,youmakesurethatthere'spaper.Man:Yeah,uhuh.
Woman:Yes,fine...here.Andthenyouputthedocumentdown.Facedown.
Man:Mhm.
Woman:Right.Andthenyouindicateinthedigitaldisplayherehowmanycopi
