nod factor

例句：

1. 1. The researchers found that the nod factor was responsible for the animal's behavior.
   研究人员发现点头因子是动物行为的原因。
2. 2. The scientist discovered a new nod factor that could help people with dementia.
   科学家发现了一种新的点头因子，可以帮助患有痴呆症的人。
3. 3. The nod factor is thought to be linked to the brain's ability to communicate with other animals.
   点头因子被认为是与大脑与其他动物沟通的能力有关的。