Sarah:Oh,how could it be?you have repaired it for once,it's expected to be all right this time,isn't it?
Steven:Yes,it is,in fact,after being repaired,it worked well,however,yesterday,when I was using my email,it broked down again.
Sarah:It must be these viruses that contribute to your computer crisis,which are too strong for you to clear out.
Steven:You must be right!so what should I do now?
Sarah:You can install software to guard against viruses so as to protect your computer.
Steven:That's a good idea,but can you give me a piece of advice for software?I Know little about
computer.
Sarah:Of course,it's my pleasure
Steven:Thank you
Sarah:You're welcome