Americanlovesports……whatisthepassagemainlytalkingabout?
Americanslovesports—theylovetoplaythem,towatchthemontelevision,andtotalkaboutthem.Butthishobbysometimeshasseriousresults—atleasttotheplayers.Forexample,whenpeopleplaytennis,sometimestheyhurttheirelbow（肘部）andinthiswaytheydevelop“tenniselbow”.Alsoitiseasytohurtakneeinafootballgame.Theseinjuries（损伤）happenwhiletheplayerishavingfun,buttheystillhurt.
Afewmonthsago,KathleenSimmons,wholovesplayingvolleyball,hurtherkneeinavolleyballgame.Herdoctortoldherthatsheneededaverydifficultoperation（手术）orshemightnotbeabletoplayagain.Shefeltverysadanddidn’tknowwhattodo.
ThenSimmonslearnedabout“videooperation”.Withthehelpofthisnewscienceinmedicine,doctorscannowrepairmanyinjuriesandgetpeoplebackontheplayingfieldandbacktotheirjobsmuchfaster.Simmonsfoundahospitalthatwasusingthisnewscienceandwenttoseethedoctorthere.Thedoctorstoldhertheoperationcouldhelp.
Forthisoperation,herdoctordidn’thavetoopenherknee.Insteadheputaverysmallcameralens（镜头）insideherknee.Thelenssentbackpictures,whichappearedonatelevisionscreen.Asheworked,hecouldseetheinsideofherkneeontheTV.Withthehelpofthelargepicturesonthescreen,thedoctorknewexactlywhattodowhenhewasmakingtherepairs.
whatisthepassagemainlytalkingabout?