virus vector

例句：

1. 1. Viruses are spread through the air by droplets from infected people.
   病毒通过感染者呼出的飞沫在空气中传播。
2. 2. The study found that a common virus could be the vector for spreading the disease.
   研究发现，一种常见的病毒可能是传播这种疾病的媒介。
3. 3. The research team used a new virus vector to test the efficacy of their treatment.
   研究团队使用了一种新型病毒载体来测试他们治疗方法的有效性。