Computershavebecomeveryimportantinmanyareasofworkandplay.

　　Thereisnodoubtthatcomputersareveryusefulintechnologyandbusiness.Inspace,computershelpastronautsandpilotscontrolthespeedanddirectionofaspaceship'sflight.Withthehelpofcomputers,doctorscanfinddiseaseseasilyandsolveotherproblems.Forexample,tinycomputersinsidepeople'sbodieskeeptheirheartsbeatingwell.Infactories,robotscontrolledbycomputerscandoworkthatisdangeroustohumans.Computersarealsousedinbusinesstoplaceandcancleorders.Atthesametime,theyhavemadetheworkplacesaferandbetter.

　　SincetheInternetcameintobeing,people'slivesathomehavechanged,too.Moreandmorepeoplehavepersonalcomputers,andtheyusethemtoplaygamesandwatchmovies.ThankstotheInternet,peoplecandoshoppinganddobusinessathome.Insteadofwrittinglettersonpaper,peoplecommunicatebysebdinge-mailsandchattingonline.Thewholeworldisconnected.Computershavemadetheworldsmaller,likea"village".

　　Computershaveimprovedourlives,buttheyhavebroughtproblems,too.Forinstance,ifweworkoncomputerstoolong,wemaygetheadachesorsoreeyes.Ifweplaycomputergamestoomuch,wewon'tstudywellandgetenoughexercise.Althoughcomputershelpusworkandathome,wemustusethemproperly.