'virus visna'是英语，中文翻译为“绵羊嗜神经病毒”。
绵羊嗜神经病毒是一种影响绵羊神经系统的疾病，可导致绵羊出现肌肉萎缩、体重减轻、运动失调、视力和听力问题等症状。这种病毒主要通过污染的血液和乳汁传播。在绵羊养殖业中，绵羊嗜神经病毒是一种常见疾病。
以下是9个含有'virus visna'的例句：
1. The transmission of the virus visna can be reduced through proper management and hygiene practices. (绵羊嗜神经病毒的传播可以通过适当的管理和卫生实践来减少。)
2. A vaccine has been developed to prevent the spread of virus visna in sheep populations. (已经研制出一种疫苗，以预防绵羊群体中绵羊嗜神经病毒的传播。)
3. Infected sheep may show symptoms of virus visna for several years before finally succumbing to the disease. (感染的绵羊可能会表现出绵羊嗜神经病毒的症状数年，最终才会死于疾病。)
4. The presence of virus visna in a flock can significantly reduce the productivity and profitability of a sheep farm. (羊群中存在绵羊嗜神经病毒可以显著降低绵羊农场的生产力和盈利能力。)
5. Early detection of virus visna is crucial to prevent the spread of the disease to other sheep. (早期发现绵羊嗜神经病毒对于预防疾病传播到其他绵羊至关重要。)
6. Regular testing for virus visna is recommended for all sheep farms to ensure the health of the flock. (建议所有绵羊农场定期检测绵羊嗜神经病毒，以确保羊群的健康。)
7. Researchers are working to develop new treatments for sheep infected with virus visna. (研究人员正在努力研发对感染绵羊嗜神经病毒的绵羊进行治疗的新方法。)
8. The economic impact of virus visna can be devastating for small sheep farmers. (绵羊嗜神经病毒的经济影响对于小型绵羊养殖户来说可能是毁灭性的。)
9. Proper quarantine measures should be taken to prevent the introduction of virus visna into a sheep farm. (应采取适当的隔离措施，以防止绵羊嗜神经病毒进入绵羊农场。)
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