只有症状持续至少一个月医生才能诊断创伤后应激障碍。

Doctors can't diagnose PTSD until symptoms have persisted for at least a month.

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这些症状在糟糕的事情发生后很常见，但必须持续至少一个月才能称作创伤后应激障碍。

And while some or all of these symptoms are common after terrible things happen, symptoms have to last for at least a month to qualify as PTSD.

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在一项研究中，布莱诺和同事们发现，在2001年911事件的幸存者中仅有25%的人在六个月后患上了创伤后应激障碍。

In one study, Bonanno and colleagues found that just 25 percent of people who were at the World Trade Center during the terrorist attacks on Sept. 11, 2001, suffered from PTSD six months later.

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