1. As conditions deteriorate, city populations would eventually collapse due to malnutrition, disease, and perhaps violence.
    由于条件的恶化，城市人口最终会因营养不良、疾病蔓延，也许还因暴力行为而锐减。

2. Anti-rejection drugs, it turned out, also weakened the body´s resistance to any disease-carrying germs which came its way.
    服用抗排斥异体药物会削弱人体对入侵病菌的抵抗力。

3. And parents whose child has a fatal disease like cancer might be able to clone the child, creating a twin who could be a bone-marrow (骨髓) donor.
    而那些孩子患有诸如癌症等不治之症的父母也能克隆一个孩子，创造出一个能提供骨髓的双胞胎。

4. Scientists discovered that this particular variety of rabbit was susceptible to a fatal virus disease, myxomatosis.
    科学家们发现, 这种特殊品质的兔子易患一种叫做"多发性粘液瘤"的致命病毒性疾病.

5. Scientists discovered that this particular variety of rabbit (and apparently no other animal) was susceptible to a fatal virus disease, myxomatosis.
    科学家们发现，这种特殊品种的兔子（显然不包括别的动物）易患一种叫"多发性粘液瘤"的致命毒性疾病。

6. Prevention of disease is very important.
    预防疾病是很重要的。

7. Measles is an infectious disease.
    麻疹是一种传染病。

8. Measles is an infectious disease.
    麻疹是一种传染病。

9. Mad Cow Disease (BSE) in cattle, salmonella in chicken and eggs, and listeria in dairy products.
    牛肉中的疯牛病，鸡肉和鸡蛋中的沙门氏菌，奶制品中的利斯特杆菌。

10. Modern medicine owes a great deal to the discovery of certain tiny disease-carrying organisms.
    某些传染疾病的微生物的发现，对现代医学的发展作出了巨大的贡献。