跟读练习: SVINutes: Collateral Circulation - 通过视频学习英语口语
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Hi, I'm David Liebeskin speaking to you from the USC Neurovascular Institute, talking to you about collateral circulation.
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So collateral circulation we know has been important for hundreds of years in terms of blood flow in the brain
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and specifically with respect to ischemia or ischemic stroke, both in terms of different stages in terms of the onset of stroke, the likelihood that you're going to develop a stroke,
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as well as in terms of what happens once someone does have a stroke.
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Collaterals are important.
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These are these alternative blood flow channels that provide blood flow when the main artery is blocked to the brain, and it offsets the ischemic injury or the damage that is done.
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It is a compensatory mechanism where the brain actually is able
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to sustain itself against the lack of blood flow in that region of the brain.
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Collateral circulation is seen with a variety of different imaging methods, and this is where we've learned the most about collateral circulation from originally from angiography
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and in most recent decades from non-invasive imaging as well.
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So we see correlates of collateral circulation in terms of every type of imaging that we do.
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Indirect correlations, so not necessarily the direct collaterals themselves, but the collateral blood flow or perfusion,
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the collateral arterial roots or the connections or anastomosis that we call them, as well as the consequences in terms of what happens in terms of the amount of ischemic damage,
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as well as what can happen in terms of reperfusion injury and hemorrhage.
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So collaterals are important because they reflect the likelihood we're able to reperfuse the brain, to what extent, and the recovery after stroke as well.
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So grading collaterals is very important.
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We do this routinely as an imaging core lab, but it's done in routine practice on a daily basis from non-invasive as well as angiographic methods.
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Collateral circulation has been associated with different demographics, different patient status, comorbidities as well.
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And it is important to think about these things in terms of diagnosing patients, not just with stroke, but in terms of their collateral status and the likelihood that they're gonna rapidly progress or not.
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This is important because we can plan treatment based on that.
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We can plan how aggressive we need to be, or should be, in training that acute ischemic stroke with endovascular therapy or other alternative approaches.
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Increasingly, and in recent years, this is important in terms of neuroprotection or cytoprotection, where we try alternative methods of protecting the brain.
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Patients with poor collaterals may have a greater need for neuroprotection or cytoprotection, where the brain is not able to recover as well.
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So grading collaterals in terms of these indirect measures on imaging is important, whether with CT or MRI techniques. In sum,
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collaterals are very important in terms of how patients do from A to Z throughout the entire course of the disease.
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And it's very important to use the imaging
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that we have available on a daily basis to estimate what we can do from a therapeutic standpoint.
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Thank you.
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通过本视频可提升的英语口语技能
本视频适合用于英语影子跟读练习，能帮助学习者掌握专业领域话题的表达逻辑，提升长句复述能力，同时学会在说明复杂概念时如何清晰分层。此外，还可锻炼用英语解释医学术语（如collateral circulation）的能力，增强口语的专业性与准确性。
需注意的连读与弱读现象
视频中存在多处连读和弱读，例如：“in terms of”中“in”与“terms”连读为/ɪnˈtɜːmzəv/；“as well as”中“as”弱读为/əz/；“collateral circulation”中“collateral”与“circulation”连读时，前者尾音/l/与后者首音/s/自然衔接。这些现象是提高英语发音的关键，影子跟随时需重点模仿。
像母语者一样表达：节奏与重音技巧
模仿视频中演讲者的节奏和重音，可让口语更自然。以下是关键技巧：
- 重音位置：医学术语如“ischemic stroke”（缺血性中风）重音在“is-”和“stroke”上；“angiography”（血管造影）重音在“an-”。
- 节奏控制：说明因果关系时（如“Collaterals are important because...”），“because”后稍作停顿，再缓慢输出原因，体现逻辑层次。
- 强调语气：表达重要性时（如“very important”“critical”），适当提高音量并延长发音，增强说服力。
利用shadowing site反复练习，结合shadow speech方法，逐句跟读并对比录音，可快速掌握这些技巧，提升英语口语的流畅度与地道性。
视频中的语法
说话人最常用的结构，并附上视频中的原话：
| 结构 | 视频中的用法 |
|---|---|
| 现在完成时 have/has + 过去分词 — 过去发生但与现在仍有关联的事 | has been · we've learned · has been associated |
| 被动语态 be + 过去分词 — 强调发生了什么，而不是谁做的 | is blocked · is seen · has been associated |
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。