| 1. | The guilty virus has yet to be identified .
这种致病的病毒尚待查明。 |
| 2. | How was it linked to the disease-causing virus ?
它与致病病毒有什么关联呢？ |
| 3. | Smoking is responsible for many cases of lung cancer .
吸烟是许多人患肺癌的致病因素。 |
| 4. | The pathogenicity of the other organisms has not been assessed .
其他细菌的致病力则还没有测定。 |
| 5. | Many of the pathogenic organisms may be encased in the particles .
许多致病生物体可能被粒子所包围。 |
| 6. | The pathogenicity of moniezia expansa in sheep has long been debated .
绵羊扩展莫尼茨绦虫的致病力已经争论很久了。 |
| 7. | The term pathogenicity denotes the ability of a parasite to cause disease .
致病性这一术语是指寄生物引起疾病的能力。 |
| 8. | Disease-producing bacteria develop normally within the tissues of an infected host .
致病的细菌通常在罹病的寄主的组织里发展。 |
| 9. | Disease-causing cells might accidentally escape from a laboratory and spread throughout the world .
致病细胞可能偶然地逸出实验室并散布遍及整个世界。 |
| 10. | Many different strains are known but only the smooth(s)strains can cause the disease .
现在知道，在肺炎球菌的许多不同菌株中，只有光滑型（s）菌株能致病。 |
