以下为句子列表：
英文: Is post-traumatic stress disorder a neurologic or psychiatric disease (or perhaps neither)? What drug treatments are available, and what neurochemical mechanisms probably underlie their actions?
中文: 压力创伤后遗症是神经或是精神疾病(或者都不是)？可用什麽样的药物治疗，什麽样的神经化学机制造成他们的行为？
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英文: The researchers found that children with post-traumatic stress disorder and high levels of the stress hormone cortisol were likely to experience a decrease in the size of the hippocampus - a brain structure important in memory processing and emotion.
中文: 这些研究者发现患有创伤后应激障碍的儿童和体内应激激素皮质醇含量高的儿童可能出现海马体积的缩小（海马是参与记忆过程和情绪反应的重要脑结构）。
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英文: With some units now on their fourth deployment, an army medical survey in Iraq last month found higher levels of mental-health problems, including a 24% level of post-traumatic stress disorder among those on multiple combat tours.
中文: 一些作战单位现在正在第四次布防的任上，上个月一份伊拉克驻军的医疗调查发现，心理健康问题占有很大比例，包括执行复合巡逻任务的有24%患有创伤后应激障碍。
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