跟读练习: What causes avalanches, and can you survive them? - Simon Trautman - 通过YouTube学习英语口语
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In February 2012, pro skier Elyse Saugstad was carving through the slopes of the Cascade Mountains when a crack formed in the snowpack above her.
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In February 2012, pro skier Elyse Saugstad was carving through the slopes of the Cascade Mountains when a crack formed in the snowpack above her.
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Before she was fully engulfed by a 5,000-ton wall of snow, Elyse heard “AVALANCHE!” just in time to react with a lifesaving maneuver.
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So, how could she survive this crushing snow surge?
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Avalanches are the rapid descension of snow, ice, rock, or a combination of these down a slope.
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They can be destructive natural disasters and personal tragedies: in the United States alone, avalanches kill an average of 27 people annually.
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These alpine nightmares don’t just awaken out of nowhere; they need three specific conditions.
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First, the mountain needs to have the right slope, typically between 30 and 45 degrees.
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This is shallow enough to allow snow to build up on the slope, yet steep enough to provide enough potential energy for movement.
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Second, they typically need a layer of sturdy snow deposited over a weak or unstable layer, or what’s sometimes called “something over nothing.” Take the Cascade Mountain avalanche, where recent heavy storms deposited a nearly 1-meter-deep slab of fresh snow.
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Below this sat a thin layer of surface hoar.
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These are delicate, feathery ice crystals that form when water vapor in the air rapidly freezes on the surface of snow, almost like dew in the wintertime.
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Finally, avalanches need a trigger, something to collapse the weak layer and put the snow in motion.
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A trigger can be natural, such as heavy snowfall, strong winds, rainfall, or even other avalanches.
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Or they can be human-caused, like the surface impact of skiers or snowmobilers.
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Since fractures can propagate quickly through the snowpack, triggers can originate hundreds of meters away— upstream, downstream, or even adjacent to the avalanche’s path.
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Once in motion, how quickly an avalanche moves depends on the slope’s steepness, its exposure or vegetation cover, terrain roughness, and the type and amount of snow involved.
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For example, dry, light, and loosely bonded snow tends to travel fast, forming a powder cloud as it moves.
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In contrast, wet snow avalanches, caused by water moving through the snowpack, travel more slowly but are much denser and can be particularly destructive.
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Larger avalanches can travel more than 160 kilometers per hour, breaking trees, destroying buildings, and burying roadways.
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In 1970, one particularly massive avalanche consisting of 50 to 100 million cubic meters of glacial ice, snow, mud, and rock reached speeds of over 300 kilometers per hour.
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This avalanche proved to be the deadliest in history, engulfing an entire Peruvian town and killing 18,000 people.
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Avalanches aren't always this large, but even smaller ones can be dangerous for anyone caught in their path.
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As snow rushes downhill, it can behave like both a solid and a liquid, making its movement difficult to predict.
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At the fastest-moving front, surface snow moves faster than the snow beneath, pulling victims deep into the snowpack and scattering them across wide areas, making rescue difficult.
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Once an avalanche slows, the snow loses its fluid-like properties and compacts, leaving victims immobilized and unable to escape on their own.
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For these reasons, the best way to survive an avalanche is to avoid one altogether.
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Thankfully, at most ski resorts, parks, and even highways, avalanche workers mitigate risk by continuously monitoring the weather, stability of the snowpack, and human activity.
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If a threat is detected, they'll close terrain and may even intentionally trigger a controlled avalanche with explosives or artillery.
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However, there are regions where avalanche risk is not actively mitigated, known as the backcountry.
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Here, you are responsible for managing your own risk.
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Local avalanche centers provide avalanche forecasts, and anyone entering the backcountry should understand them, be properly trained, and carry essential rescue gear.
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And ultimately, in high-hazard terrain, there's no way to completely eliminate risk.
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The group at the Cascade Mountains consisted of highly experienced skiers.
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Yet the area was very exposed, and following a large storm, the avalanche danger forecast was elevated.
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In the end, three skiers lost their lives.
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But not Elyse, as she was able to deploy an inflatable airbag.
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These devices are imperfect and a last line of defense, yet can keep a victim closer to the surface, improving their chance of rescue should disaster strike.
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背景与背景信息
在本视频中，讲者西蒙·特劳特曼通过一个震撼的故事揭示了雪崩的根本原因以及如何在这种危险的自然现象中存活。以职业滑雪者伊莉斯·索格斯塔德的遭遇为引子，视频深入探讨了导致雪崩发生的特定条件和触发因素。在美国，雪崩每年造成平均27人死亡，这些悲剧在滑雪爱好者中引起高度关注。了解雪崩的形成和应对措施，对于热爱户外活动的朋友来说至关重要。
日常交流的五个关键词
- 雪崩 (Avalanche) - 雪、冰、岩石等向下滑动的快速行为，通常在陡坡上发生。
- 潜在能量 (Potential energy) - 影响雪崩发生的关键能量形式，通常与坡度有关。
- 触发因素 (Trigger) - 使不稳定雪层崩塌的条件，可以是自然或人为的。
- 救援装备 (Rescue gear) - 用于雪崩事故中的求生和救援的必备工具。
- 高危地形 (High-hazard terrain) - 雪崩风险较大的区域，须谨慎行事。
逐步跟读指导
想要提高你的英语口语能力，特别是在专业领域，尝试以下的方法进行英语影子跟读练习：
- 选择合适的材料: 本视频内容非常适合准备雅思口语练习的学生，可以帮助你理解复杂的概念和专业术语。
- 听并重复: 精听视频中的句子，注意音调和重音，尝试跟随视频进行即时重复，这是一种有效的英语口语练习方式。
- 分析语言结构: 关注视频中使用的句型和词汇，从而加强你的句子构建能力，特别是需要使用专业术语的场合。
- 记笔记: 在影子跟读的过程中，写下重要短语和关键词，帮助记忆和提升口语表达的自然流畅性。
- 实际应用: 尝试在小组讨论或模拟面试中使用新学的句子和表达方式，强化你对材料的理解和记忆。
采用这些步骤，你不仅能在shadowspeak中获得提升，还有助于你自信地使用英语，尤其是在涉及专业话题时。
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。