以下为句子列表：
英文: After correcting for gender and for physiological maturity, they found that kids with more severe PTSD symptoms and higher bedtime cortisol levels (another marker of stress) at the start of the study were more likely to have reductions in their hippocampa
中文: 校正了性别和生理成熟度因素之后，发现起始阶段PTSD症状较严重且在睡眠期间皮质醇水平（应激的另一个标志物）较高的儿童比其他受影响较小但依然受到创伤的同龄儿童在研究结束时海马体积缩小。
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英文: Certain things that happen in a persons life can also set the stage for anxiety disorders. Frightening traumatic events that can lead to PTSD are a good example.
中文: 在某个人生活中所发生的特定事情也可能成为酝酿焦虑症的土壤。导致创伤后压力症发生的令人恐惧的创伤性事件就是一个好例子。
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英文: It is significant that the change in the hippocampal volume corresponds to both PTSD symptom severity and increased cortisol levels.
中文: 显然，海马体积的变化与PTSD症状的严重程度和皮质醇水平的升高一致。
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英文: Once a certain threshold is reached, either through one or two very traumatic events or through chronic, high levels of stress, adults and children can begin to exhibit PTSD symptoms such as re-experience (including flashbacks, intrusive thoughts or night
中文: 一旦经受一项或两项创伤性事件或慢性高水平应激后达到某个阈限，成人和儿童便开始出现PTSD的症状如再体验（包括重现、侵入性思维或梦魇）、回避和情感麻木，以及生理的高觉醒状态（如静止时心率加快）。
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英文: These behavioral symptoms make PTSD difficult to differentiate from other conditions such as attention deficit/hyperactivity disorder.
中文: 这些行为方面的症状使PTSD难以与其它疾病区分比如注意缺陷/多动障碍。
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