Waterfowl like ducks can carry the disease without dying and pass it to poultry through contaminated waste, saliva and other means.

诸如鸭子之类的水禽可以携带这种疾病而不会死亡，并通过受污染的排泄物、唾液和其他方式将其传播给家禽。

He is an unskilful physician that cannot cure one disease without casting his patient into another.

他是一位不熟练的医生，如果不让病人患上另一种疾病，他就无法治愈一种疾病。

The asymptomatic carrier can then pass the disease on to someone else without even knowing he has it.

非传染性疾病由身体机能障碍引起的。这包括器官或组织的退行性病变，不稳定细胞的增生，以及异常的血液形成和血液循环。

She said this connection led the research team " to consider the potential of detecting the disease from one's breathing without looking at movements."

她说，这种联系促使研究团队“考虑不通过观察动作而通过呼吸检测疾病的可能性”。

And really what we use the term health span to mean is the amount of time you're alive without disease, or without some age-related functional impairment.

实际上我们使用“健康期”这个词的意思是你没有疾病或没有与年龄相关的功能障碍的时间。

And I think you can see that when you think of that picture, how destabilizing a process would be of just leaving things broadly open without disease controls.

我想你可以看到， 当你想到那张照片时，如果在没有疾病控制的情况下让事情广泛开放， 这个过程将是多么不稳定。