When you turn to drugs to numb the pain, catch a disease you'll never be rid of?

直到你需要依靠药物来止痛，染上什么不治之症为止吗？

Once again, the idea is to identify the exposures that are correlated with the rates at which people catch a disease.

同样，我们的想法是确定与人们得病率相关的暴露。

Many Somalians do not want to give blood because they are afraid of sharp needles or concerned they might catch a disease.

很多索马里人不愿献血，他们害怕尖锐的针头或担心因此感染某种疾病。

Instead of looking at a group of people who had already caught the disease, we could perform an analysis by finding a group of people and see who goes on to catch a disease, and then study their exposures.

我们可以通过找到一群人来进行分析，看看谁会继续感染疾病，继而研究他们的暴露情况，而不是观察一群已经感染疾病的人。