From definitions , fear is a pre-programmed emotion that acts as an instinctual response to potential danger .
从定义上看，恐惧是一种在面临潜在危险时所产生的本能反应，它是一种事前情绪。
These hormones govern growth and instinctual behavior such as eating , drinking , sex , anger , and reproduction .
这些激素支配身体的生长和一些本能行为，比如：吃饭、饮水、性爱、愤怒和生殖。
And this instinctual response causes different physical reactions , because when we are afraid , the adrenaline and the stress hormone cortisol are released into the blood stream .
Dogs are smart , and they possess both instinctual and physical abilities to recognize and negotiate obstacles that in many cases surpass the abilities of humans .
狗狗很聪明，它们拥有的本能和体能足够识别并且跨越障碍，多数情况下它们的能力远超人类。
The relevant instinctual unit we use to reckon time 's passage is the lifetime not some hypothetical lifetime drawn from actuarial tables , but your actual lifetime as you understand it concretely at a given moment .
