Post-traumatic stress disorder is an ongoing effect of extreme calamity, that is, a continuous, unnecessary, and uncontrollable disorder that appears after trauma. Based on the above definitions, which of the following are not post-traumatic stress disorder? ['Most American soldiers returning from the Iraqi battlefield suffer from insomnia, anxiety and even severe mental illness.', "Yang Yang was bitten by a dog at the neighbor Aunt Zhang's house when he was a kid, and never wanted to go to Aunt Zhang again.", 'Xiao Zhang was trapped in the elevator for more than five hours. At that time, he felt that he was not saved, and finally turned the risk, but from then on, Zhang often dreamed of being trapped in the elevator, and never dare to take the elevator again.', 'Witnessing the scene where his son A Mao was taken away by a wild beast, when the unsettled Xianglin was seen, he said, "I\'m so stupid, really, I just know that when it snows, the wild beasts have no food in the mountains. Come to the village, I don\'t know that there will be spring . ".']