男孩：是敌还是友？
第三，外星人很可怕，因为我们不知道他们到底是敌还是友。
Third, aliens are scary because we don't know if they are our friends or not.
人类生而具备一种本能，迅速判断当前状况是危险还是安全，面前的食物能否食用，面前的人是敌是友。
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.
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