Well, of course, the best thing is medicine for really bad diseases (疾病). A lot of scientists are working very hard to stop diseases like Ebola, a terrible disease that has killed many thousand people in Africa.

当然了，最好的东西是治疗严重疾病的药。许多科学家正在努力对抗各种疾病，如埃博拉病毒这种可怕的疾病，而非洲已有几千人因此丧命。

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The link between sleep and health, and bad sleep and disease is becoming clearer and clearer.

睡眠与健康、睡眠不好与疾病之间的联系越来越明显。

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Sugarless yogurt could help beat bad breath, tooth decay and gum disease.

无糖酸奶有助于缓解口腔异味、蛀牙和牙龈疾病。

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Why is disease bad? Well, among other things, it means perhaps that you can't enjoy yourself.

疾病为什么是坏的？不算其他，它意味着你不能享受生活。

耶鲁公开课 - 死亡课程节选

It's a very bad disease.

NPR: Slate's Medical Examiner: Chickenpox Vaccine Risks

Unfortunately the cure--a severe contraction of its operations--looks as bad as the disease.

FORBES: Doghouse On Wheels

The fall in the harvest is being attributed to bad weather and disease.

BBC: Afghanistan opium harvest drops by a third - UN