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1.heard of… 听说……
I heard of a kind of internet virus called Worm.
2.be infected with 被感染……
My E-mail is infected with virus.
3.have to do 不得不……
You have to delete the E-mail completely.
4.as well 也
You can delete the virus as well.
5.turn on 打开
Remember you should turn on your firewall.