跟读练习: C1 T1 TEST1 PART1 - 通过视频学习英语口语
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Thousands of U .S troops in Iraq and Afghanistan sustained concussions and other brain injuries from roadside bombs.
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But a new study suggests these injuries are not leading to a brain condition often seen in former boxers and football players.
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NPR's John Hamilton reports.
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In contact sports, concussions increase the risk of chronic traumatic encephalopathy, or CTE.
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It's a brain condition associated with dementia and a range of psychiatric disorders.
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So many doctors have worried that CTE might be a factor in the mental health problems experienced by U .S.
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combat troops exposed to bomb blasts.
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Dr. Daniel Pearl is a professor of pathology at the Uniformed Services University in Bethesda.
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Their families were saying that their personalities had changed.
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They were having trouble sleeping.
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We know that the suicide problem is substantial.
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PTSD is prevalent.
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CTE can only be diagnosed after death.
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So Pearl and a team decided to study a collection of brains donated by the families of deceased service members.
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We said this was the opportunity to look at those brains and see how much CTE played a role in this problem.
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The team looked at 225 brains, including many from military personnel who'd been exposed to bomb blasts.
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Pearl says CTE was rare.
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We could only find 10 cases that met the diagnostic criteria for CTE.
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and then we found that all 10 had played contact sports.
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The numbers are too small to say that contact sports caused the condition.
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But Pearl says the findings, which appear in the New England Journal of Medicine, do support another conclusion.
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Serving in the military and being exposed to blasts is probably not a significant risk factor for developing CTE.
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Pearl says that's a good thing, but he adds that bomb blasts do injure the brain in ways that can have lasting effects.
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One shouldn't go away thinking that because we didn't find CTE, the brain's normal.
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That's clearly not the case.
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Pearl says a growing body of evidence shows that exposure to bomb blasts can raise the risk of problems like PTSD.
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John Hamilton, NPR News.
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关于本课
您正在使用跟读技巧通过视频"C1 T1 TEST1 PART1"练习英语口语和发音。
每天练习15到30分钟，将显著提高您的英语流利度和发音准确度。
什么是跟读法？
跟读法 (Shadowing) 是一种有科学依据的语言学习技巧，最初开发用于专业口译员的培训，并由多语言者Alexander Arguelles博士普及。这个方法简单而强大：您在听英语母语原声的同时立即大声重复——就像是一个延迟1-2秒紧跟说话者的影子。与被动听力或语法练习不同，跟读法强迫您的大脑和口腔肌肉同时处理并模仿真实的讲话模式。研究表明它能显着提高发音准确性，语调，节奏，连读，听力理解和口语流利度——使其成为雅思口语备考和真实英语交流最有效的方法之一。