| 1. | Active causes of the disease should be isolated from other cattle . 活动性病例应与其它牛隔开。 |
| 2. | When the cause of the disease was found to be a virus it was named tobacco rattle virus . 当人们发现引起这种病害是一种病毒时,便称它为烟草脆裂病毒。 |
| 3. | The scientist researched the cause of the disease 科学家研究了这种疾病的起因。 |
| 4. | They researched into the causes of the disease 他们曾研究过这种病的原因。 |
| 5. | Nobody konw the cause of the disease 造成这种疾病的原因迄今几乎一无所知。 |
| 6. | So far , it ' s a secret which the cause of the disease 造成这种疾病的原因迄今几乎一无所知。 |
| 7. | A major cause of the disease in this area is unclean water 这个地区疾病的主要原因是水不清洁。 |
| 8. | Do you know the cause of the disease 你知道这种疾病的原因吗 |
| 9. | Recent research has shed new light on the causes of the disease 最近的研究结果对该病的病因已有新的了解 |
| 10. | Recent research has thrown new light upon the causes of the disease 最近的研究结果使得该病的病因非常清楚。 |