跟读练习: What happens when you break a bone? - Gurpreet Baht and Natalie Pang - 通过YouTube学习英语口语
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Roughly 50% of people will break a bone at some point in their lives.
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Roughly 50% of people will break a bone at some point in their lives.
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But whether the cause is as mundane as a slip on the ice or as dramatic as a tightrope-walking accident, broken bones tend to heal the same way.
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The human body's 200 plus bones come in many shapes and sizes, referred to by medical professionals as short bones, long bones, flat bones, and the catch-all category of irregular bones.
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Despite their differences, bones generally have a rigid structure composed of a protein matrix that’s dotted with bone cells and reinforced with minerals containing calcium.
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Inside these stiff exteriors is spongy marrow, containing stem cells that can divide and differentiate into specialized cell types.
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Bones are also penetrated by blood vessels and nerves, which relay the searing pain signal associated with the break.
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Since these nerves are encased in hard tissue they’re very difficult to study, so we still don't know exactly why broken bones hurt so much.
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But we do know that long bones are the most likely to break since they often take the brunt of the impact from a fall.
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Whether an accident causes a clean break or a splintering crack, any kind of fracture makes the blood vessels inside the bone rupture, causing internal bleeding and inflammation.
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This signals the body to start the first step of the healing process: the inflammatory phase.
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For the next week, the body floods the injury site with immune cells which remove damaged tissue and help prepare the site for healthy new tissue to grow.
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The cells also release signaling molecules that recruit stem cells to the area.
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As they arrive, these stem cells differentiate into chondrocytes.
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These cells use the clotted blood at the break site as a scaffold to build callus made of cartilage.
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Cartilage can grow very quickly, making it a useful temporary patch.
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But it’s much weaker than bone, so over the following weeks, some of the chondrocytes and stem cells develop into special bone-building cells called osteoblasts that can create a stronger bony callus.
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Once the bony callus is complete, the remodeling phase can begin.
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Over the next few months, another type of cell eats away at the bony callus as osteoblasts lay down new bone tissue.
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This phase is where most of the bone healing happens, restoring the injury site to its previous shape.
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But the healing timeline varies widely depending on a patient's diet, how much rest they’re getting, and how messy the break is.
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A clean break generally heals the fastest, and doctors use casts and splints to keep bones aligned as they heal.
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But if the bone has been splintered into tiny fragments and significantly displaced, surgery may be required to put those pieces back in place.
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And if a bone does heal while misaligned, a surgeon would need to refracture it, realign it, and then use pins, plates, or screws to hold the bone together.
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When the remodelling phase is over, there may be a slight bump at the fracture site, but this typically resolves over time, leaving the bone just as strong as it was before.
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Naturally, the strength of our bones varies from person to person.
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And older populations are more likely to break their bones in the first place, since bone density tends to decrease with age.
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Researchers are still investigating why this happens, but fortunately, we already know the best way to keep bones strong.
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Even when they aren’t healing, bones are constantly remodeling— adjusting their density and strength to the amount of force they’re typically under.
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So exercises like walking, running, and weightlifting all stimulate your bones to grow denser.
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Just make sure whatever activity you're doing is relatively safe, because there’s nothing humorous about a broken humerus.
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关于本课
本视频探讨了骨折的发生及愈合过程，适合想要提升英语口语能力的学习者。在本课中，学习者将练习与“健康与医学”相关的词汇主题，包括骨骼结构、愈合过程和伤痛体验。同时，本课提供了与医疗场景相关的语法模式和口语表达，让学习者在讨论健康话题时更具信心。
重要词汇和短语
- break a bone (骨折): 指骨骼因外力作用而发生断裂。
- healing process (愈合过程): 受伤后的身体修复和恢复的阶段。
- inflammation (炎症): 身体对伤害的反应，通常伴随肿胀和疼痛。
- osteoblasts (成骨细胞): 负责新骨形成的细胞。
- remodeling phase (重塑阶段): 骨头愈合后，恢复其原有形状和强度的过程。
- cartilage (软骨): 一种比骨头弱的组织，在骨折愈合时起到暂时支撑的作用。
本视频练习技巧
在进行跟读练习时，建议学习者先慢速播放视频，然后逐渐提高语速，以便适应自然的对话节奏。注重拍摄者的发音和重音，这能帮助提高英语流利度和口语表达能力。同时，由于视频内容涉及专业医疗术语，建议在练习之前提前了解这些词汇，以便在跟读时能更好地理解和掌握。可尝试模仿视频中的口音和语调，增强发音练习的效果。在雅思口语考试中，可通过讨论与健康有关的话题来展示你的语言水平，因此本课内容对考试的准备也十分有益。
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。