It's scanning for viruses.
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Jack: Could I use your computer to send an e-mail please?
Mary: Not at the moment I'm afraid. Come back in half an hour.
Jack: Why's that, is there something wrong with it?
Mary: No, it's scanning for viruses.
Jack: Is that important?
Mary: Oh yes. If you don't set it to scan for viruses regularly, you could miss a virus which would give your computer a serious infection.
Jack: Thanks for the tip. See you in 30 minutes.
杰克：請(qǐng)問(wèn)可不可以借用你的計(jì)算機(jī)寄一封電子郵件？
瑪麗：對(duì)不起，現(xiàn)在不可以。你半小時(shí)后再來(lái)吧。
杰克：為什么？計(jì)算機(jī)有毛病嗎？
瑪麗：不是，只是在檢查有沒(méi)有病毒。
杰克：這有必要嗎？來(lái)源：考試大
瑪麗：當(dāng)然有。假如你不設(shè)定計(jì)算機(jī)定期檢查病毒，就可能有病毒未能及時(shí)發(fā)現(xiàn)，使計(jì)算機(jī)受到嚴(yán)重感染。
杰克：謝謝指教。三十分鐘之后我再來(lái)吧。
計(jì)算機(jī)有所謂bug（臭蟲(chóng)）和virus（病毒）。Bug指程序設(shè)計(jì)的小錯(cuò)誤，例如：The software must be debugged before it can be used（這軟件要先除去錯(cuò)誤，才可使用）。Virus則是故意設(shè)計(jì)使計(jì)算機(jī)不能正常運(yùn)作的程序，和bug不同。
當(dāng)然，個(gè)別病毒可以用bug為名，例如：The Love Bug virus was said to have been written by a Filipino（ ‘愛(ài)蟲(chóng)’病毒據(jù)說(shuō)是出于－菲律賓人之手）。病毒經(jīng)過(guò)改寫(xiě)，就成為變種，叫variant，例如：Your computer has been infected with a new variant of the virus（你的計(jì)算機(jī)感染了病毒的新品種）。有些病毒會(huì)偽裝為實(shí)用的程序，進(jìn)入計(jì)算機(jī)系統(tǒng)之后，則伺機(jī)破壞，這類病毒叫Trojan horse（特洛伊木馬），取古時(shí)特洛伊王國(guó)被希臘人用木馬攻陷的故事。I am afraid you have downloaded a highly destructive Trojan horse program即‘你恐怕是下載了個(gè)破壞力巨大的特洛伊木馬程序’。清除病毒，英文叫remove/disinfect a virus，例如：The disinfection process involves removing the virus from the computer system and repairing any damage（消毒過(guò)程包括除去計(jì)算機(jī)系統(tǒng)的病毒，并修復(fù)有被破壞的地方）。
預(yù)防病毒的軟件或程序，叫anti-virus software/program，例如：An anti-virus program is scanning the computer's memory and disk drives for viruses（防毒程序正檢查計(jì)算機(jī)的內(nèi)存和磁盤驅(qū)動(dòng)器，看看有沒(méi)有病毒）。
對(duì) 話www.Ｅxamda.CoM
Jack: Could I use your computer to send an e-mail please?
Mary: Not at the moment I'm afraid. Come back in half an hour.
Jack: Why's that, is there something wrong with it?
Mary: No, it's scanning for viruses.
Jack: Is that important?
Mary: Oh yes. If you don't set it to scan for viruses regularly, you could miss a virus which would give your computer a serious infection.
Jack: Thanks for the tip. See you in 30 minutes.
杰克：請(qǐng)問(wèn)可不可以借用你的計(jì)算機(jī)寄一封電子郵件？
瑪麗：對(duì)不起，現(xiàn)在不可以。你半小時(shí)后再來(lái)吧。
杰克：為什么？計(jì)算機(jī)有毛病嗎？
瑪麗：不是，只是在檢查有沒(méi)有病毒。
杰克：這有必要嗎？來(lái)源：考試大
瑪麗：當(dāng)然有。假如你不設(shè)定計(jì)算機(jī)定期檢查病毒，就可能有病毒未能及時(shí)發(fā)現(xiàn)，使計(jì)算機(jī)受到嚴(yán)重感染。
杰克：謝謝指教。三十分鐘之后我再來(lái)吧。
計(jì)算機(jī)有所謂bug（臭蟲(chóng)）和virus（病毒）。Bug指程序設(shè)計(jì)的小錯(cuò)誤，例如：The software must be debugged before it can be used（這軟件要先除去錯(cuò)誤，才可使用）。Virus則是故意設(shè)計(jì)使計(jì)算機(jī)不能正常運(yùn)作的程序，和bug不同。
當(dāng)然，個(gè)別病毒可以用bug為名，例如：The Love Bug virus was said to have been written by a Filipino（ ‘愛(ài)蟲(chóng)’病毒據(jù)說(shuō)是出于－菲律賓人之手）。病毒經(jīng)過(guò)改寫(xiě)，就成為變種，叫variant，例如：Your computer has been infected with a new variant of the virus（你的計(jì)算機(jī)感染了病毒的新品種）。有些病毒會(huì)偽裝為實(shí)用的程序，進(jìn)入計(jì)算機(jī)系統(tǒng)之后，則伺機(jī)破壞，這類病毒叫Trojan horse（特洛伊木馬），取古時(shí)特洛伊王國(guó)被希臘人用木馬攻陷的故事。I am afraid you have downloaded a highly destructive Trojan horse program即‘你恐怕是下載了個(gè)破壞力巨大的特洛伊木馬程序’。清除病毒，英文叫remove/disinfect a virus，例如：The disinfection process involves removing the virus from the computer system and repairing any damage（消毒過(guò)程包括除去計(jì)算機(jī)系統(tǒng)的病毒，并修復(fù)有被破壞的地方）。
預(yù)防病毒的軟件或程序，叫anti-virus software/program，例如：An anti-virus program is scanning the computer's memory and disk drives for viruses（防毒程序正檢查計(jì)算機(jī)的內(nèi)存和磁盤驅(qū)動(dòng)器，看看有沒(méi)有病毒）。