AIDS is a fatal disease that cripples the immune system，leaving the victim susceptible to illness the body can easily fight off2，such as pneumonia，meningitis and cancer called Kaposi's carcinoma.It's caused by a virus known as human immune deficiency virus，or HIV.Symptoms of full-blown AIDS3include a persistent cough，fever and difficulty in breathing.Multiple purplish blotches4 and bumps on the skin may indicate kaposi's carcinoma，a cancer associated with AIDS.The virus can also cause brain damage.
注釋：
1.(be)exposed to與…接觸
2.fight off 抵禦
3.full blown AIDS嚴重的艾滋病
4.multiple purplish blotches多形性紫斑
譯文
什麼是艾滋病？
艾滋病(又叫獲得性免疫力缺乏綜合症)仍然既令人恐懼又使人不解。人們對這種可怕疾病的恐懼心理甚為強烈，錯誤的概念廣為流行。雖然有許多艾滋病之迷還未被破解，有關它的信息卻增加得很快。醫生們相信現在已經知道了它的傳播途徑，能檢查出某人是否接觸過這種病毒，並知道如何預防它的傳染。
艾滋病是一種破壞免疫係統功能的致命性疾病，它使患者易患上人體通常能抵禦的疾病，如肺炎、腦膜炎和某種稱為卡波濟氏肉瘤的癌症等多種疾病。艾滋病是由某種人體免疫缺陷病毒引起的。嚴重艾滋病的症狀包括持續性咳嗽、發燒和呼吸困難。皮膚上的多形性紫斑和腫塊可能表明發生了一種與艾滋病有關的卡波濟氏肉瘤癌。這種病毒也可損傷腦部。
(6)Symptoms of AIDS
艾滋病的症狀
STAGE 1——NO SYMPTOMS
In the first stage of HIV，the symptoms don't show up.People can live with AIDS for years without knowing it.Blood tests at the doctors will show antibodies after the form to fight the AIDS virus，but it takes the antibodies three months to show up.That means that if you take a blood test right after you have sex，the virus won't show up for another three months.
STAGE 2——MILD ILLNESS
At this stage，the virus grows within the white blood cells and destroys them.When most of the cells are destroyed，the immune system is destroyed and the body weakens.Some symptoms they might form are：they begin feeling tired，loose weight.They may develop a cough，diarrhea，fever，or sweating all night.With HIV，a cold is more threatening to them than to a person without the disease.
STAGE 3——SEVERE ILLNESS
By this time，the AIDS virus has nearly destroyed the body'simmune system.The body has great difficulty fighting off germs.In addition，patients can develop a rare type of cancer called Kaposi'scarcinoma1 AIDS doesn't kill anyone，but other infections and cancer do.