Although current virus prevention programs cannot give an absolute guarantee that they will not be penetrated by new viruses, this is like having steel bars on the windows: though they won't necessarily stop a thief, "it's better to have them than not."
儘管目前防毒程式不能保證絕對不被新病毒破解，但這就像鐵窗雖不一定防得了小偷，卻「有比沒有好」。