If we imagine the human body's immune system as like a stout Great Wall, helping us resist the entry of disease, then what's most frightening about AIDS is that it doesn't want to break through "into the country"; its object of destruction is the wall itself.
更何況在進口疫疾急速本土化的情況下，愛滋病早已不是「舶來病」了。如果我們把人體免疫系統比做一道堅實的長城，幫助我們抵抗病菌入侵，那麼愛滋病毒之可怕，正在它不像別的病菌只是趁機闖關，蒙混入境；它挑戰的對象，根本就是長城本身。