跟讀練習: SVINutes: Collateral Circulation - 通過影片學習英語口語

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Hi, I'm David Liebeskin speaking to you from the USC Neurovascular Institute, talking to you about collateral circulation.

So collateral circulation we know has been important for hundreds of years in terms of blood flow in the brain

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,

as well as in terms of what happens once someone does have a stroke.

Collaterals are important.

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.

It is a compensatory mechanism where the brain actually is able

to sustain itself against the lack of blood flow in that region of the brain.

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

and in most recent decades from non-invasive imaging as well.

So we see correlates of collateral circulation in terms of every type of imaging that we do.

Indirect correlations, so not necessarily the direct collaterals themselves, but the collateral blood flow or perfusion,

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,

as well as what can happen in terms of reperfusion injury and hemorrhage.

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.

So grading collaterals is very important.

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.

Collateral circulation has been associated with different demographics, different patient status, comorbidities as well.

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.

This is important because we can plan treatment based on that.

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.

Increasingly, and in recent years, this is important in terms of neuroprotection or cytoprotection, where we try alternative methods of protecting the brain.

Patients with poor collaterals may have a greater need for neuroprotection or cytoprotection, where the brain is not able to recover as well.

So grading collaterals in terms of these indirect measures on imaging is important, whether with CT or MRI techniques. In sum,

collaterals are very important in terms of how patients do from A to Z throughout the entire course of the disease.

And it's very important to use the imaging

that we have available on a daily basis to estimate what we can do from a therapeutic standpoint.

Thank you.

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通過本影片可提升的英語口語技能

本影片適合用於英語影子跟讀練習，能幫助學習者掌握專業領域話題的表達邏輯，提升長句複述能力，同時學會在說明覆雜概念時如何清晰分層。此外，還可鍛鍊用英語解釋醫學術語（如collateral circulation）的能力，增強口語的專業性與準確性。

需注意的連讀與弱讀現象

影片中存在多處連讀和弱讀，例如：“in terms of”中“in”與“terms”連讀為/ɪnˈtɜːmzəv/；“as well as”中“as”弱讀為/əz/；“collateral circulation”中“collateral”與“circulation”連讀時，前者尾音/l/與後者首音/s/自然銜接。這些現象是提高英語發音的關鍵，影子跟隨時需重點模仿。

像母語者一樣表達：節奏與重音技巧

模仿影片中演講者的節奏和重音，可讓口語更自然。以下是關鍵技巧：

重音位置：醫學術語如“ischemic stroke”（缺血性中風）重音在“is-”和“stroke”上；“angiography”（血管造影）重音在“an-”。
節奏控制：說明因果關係時（如“Collaterals are important because...”），“because”後稍作停頓，再緩慢輸出原因，體現邏輯層次。
強調語氣：表達重要性時（如“very important”“critical”），適當提高音量並延長髮音，增強說服力。

利用shadowing site反覆練習，結合shadow speech方法，逐句跟讀並對比錄音，可快速掌握這些技巧，提升英語口語的流暢度與地道性。

影片中的語法

說話人最常用的結構，並附上影片中的原話：

結構	影片中的用法
現在完成時 have/has + 過去分詞 — 過去發生但與現在仍有關聯的事	has been · we've learned · has been associated
被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的	is blocked · is seen · has been associated

什麼是跟讀法？

跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。

影子跟讀法: 閱讀完整分步指南 →

跟讀練習: SVINutes: Collateral Circulation - 通過影片學習英語口語

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通過本影片可提升的英語口語技能

需注意的連讀與弱讀現象

像母語者一樣表達：節奏與重音技巧

影片中的語法

什麼是跟讀法？