Consider the fact that in the country of Botswana, the life expectancy is 36 years for somebody with AIDS compared to 71 years for somebody who has not contracted the disease.

• 我们要知道这样一个事实：在博茨瓦纳这个国家，某艾滋病患者的寿命是36，而相比之下，一个非艾滋病患者的寿命却可达到71岁。