An anxietydisorder in which a stressful event that is outside the range of usual human experience, such as military combat or a natural disaster, brings in its aftermath such symptoms as re-experiencing of the trauma and avoidance of stimuli associated with it, a feeling of estrangement, a tendency to be easily startled, nightmares, recurrent dreams, and disturbed sleep.
――《西尔格德心理学――心理学导论》（第14版）词汇表

人在遭遇严重应激事件后所产生的一种心理（焦虑）障碍。严重应激事件超出人的平常生活体验，比如军事战斗、自然灾害等，之后引起人对创伤的再体验，回避一些与创伤相关的刺激，情感疏离，易受惊吓，做恶梦，梦境反复，以及睡眠不稳等症状。

• anxiety [æŋ´zaiəti]   n.挂念；渴望；焦虑的事   (初中英语单词)
• disaster [di´zɑ:stə]   n.灾难，不幸   (初中英语单词)
• tendency [´tendənsi]   n.趋势；倾向   (初中英语单词)
• disorder [dis´ɔ:də]   n.杂乱 vt.扰乱   (高中英语单词)
• combat [´kɔmbæt]   v.&n.斗争；战斗；争斗   (高中英语单词)