Humans are born with an instinctive ability to instantly determine whether what is in front of them is safe or dangerous, edible or inedible, enemy or friend.

• 人类与生俱来就有一种本能，能够迅速识别他们面临的是安全的还是有危险的，是可以吃的还是不可以吃的，是敌人还是朋友。