跟读练习: The secret language of trees - Camille Defrenne and Suzanne Simard - 通过YouTube学习英语口语
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Most of the forest lives in the shadow of the giants that make up the highest canopy.
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Most of the forest lives in the shadow of the giants that make up the highest canopy.
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These are the oldest trees, with hundreds of children and thousands of grandchildren.
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They check in with their neighbors, sharing food, supplies, and wisdom gained over their long lives.
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They do all this rooted in place, unable to speak, reach out, or move around.
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The secret to their success lies under the forest floor, where vast root systems support the towering trunks above.
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Partnering with these roots are symbiotic fungi called mycorrhizae.
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These fungi have countless branching, thread-like hyphae that together make up the mycelium.
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The mycelium spreads across a much larger area than the tree root system and connect the roots of different trees together.
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These connections form mycorrhizal networks.
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Through mycorrhizal networks, fungi can pass resources and signaling molecules between trees.
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We know the oldest trees have the largest mycorrhizal networks with the most connections to other trees, but these connections are incredibly complicated to trace.
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That’s because there are about a hundred species of mycorrhizal fungi– and an individual tree might be colonized by dozens of different fungal organisms, each of which connects to a unique set of other trees, which in turn each have their own unique set of fungal associations.
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To get a sense of how substances flow through this network, let’s zoom in on sugars, as they travel from a mature tree to a neighboring seedling.
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Sugar’s journey starts high above the ground, in the leaves of the tallest trees above the canopy.
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The leaves use the ample sunlight up there to create sugars through photosynthesis.
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This essential fuel then travels through the tree to the base of the trunk in the thick sap.
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From there, sugar flows down to the roots.
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Mycorrhizal fungi encounter the tips of the roots and either surround or penetrate the outer root cells, depending on the type of fungi.
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Fungi cannot produce sugars, though they need them for fuel just like trees do.
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They can, however, collect nutrients from the soil much more efficiently than tree roots— and pass these nutrients into the tree roots.
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In general, substances flow from where they are more abundant to where they are less abundant, or from source to sink.
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That means that the sugars flow from the tree roots into the fungal hyphae.
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Once the sugars enter the fungus, they travel along the hyphae through pores between cells or through special hollow transporter hyphae.
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The fungus absorbs some of the sugars, but some travels on and enters the roots of a neighboring tree, a seedling that grows in the shade and has less opportunity to photosynthesize sugars.
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But why does fungus transport resources from tree to tree?
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This is one of the mysteries of the mycorrhizal networks.
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It makes sense for fungus to exchange soil nutrients and sugar with a tree— both parties benefit.
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The fungus likely benefits in less obvious ways from being part of a network between trees, but the exact ways aren’t totally clear.
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Maybe the fungus benefits from having connections with as many different trees as possible, and maximizes its connections by shuttling molecules between trees.
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Or maybe plants reduce their contributions to fungi if the fungi don’t facilitate exchanges between trees.
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Whatever the reasons, these fungi pass an incredible amount of information between trees.
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Through the mycorrhizae, trees can tell when nutrients or signaling molecules are coming from a member of their own species or not.
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They can even tell when information is coming from a close relative like a sibling or parent.
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Trees can also share information about events like drought or insect attacks through their fungal networks, causing their neighbors to increase production of protective enzymes in anticipation of threats.
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The forest’s health relies on these intricate communications and exchanges.
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With everything so deeply interconnected, what impacts one species is bound to impact others.
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本节课介绍
在这一节课中，学习者将通过了解树木之间的神秘语言来提升他们的英语口语能力。树木赋予我们深刻的洞察力，不仅在生态系统中的相互联系，还有它们如何通过地下网络来分享养分和信息。学习者将通过观察和练习与此主题相关的语法和词汇，增强他们的表达能力。通过这些练习，您将能够更自信地进行雅思口语练习，同时触及更深层次的生态学概念，提升您的 shadow speak 技能。
关键词汇与短语
- 巨人树 (giant trees) - 指森林中最高、最古老的树木。
- 共享 (sharing) - 描述树木如何交流养分与信号。
- 丛菌网络 (mycorrhizal networks) - 蘑菇通过树根连接不同树木的网络。
- 光合作用 (photosynthesis) - 树叶如何制造糖分的过程。
- 养分 (nutrients) - 树木与真菌之间交换的重要成分。
- 信号分子 (signaling molecules) - 树木用来与彼此沟通的信息。
- 环境影响 (environmental impacts) - 树木互相联系所带来的生态影响。
- 保护酶 (protective enzymes) - 树木如何应对外部威胁的反应。
练习技巧
对于本节课的 shadowing 练习，建议您遵循以下技巧：
- 慢速跟读：在您跟读视频时，注意节奏和音调。可以将视频速度调慢，可以帮助您更好地捕捉每一个单词和短语。
- 模仿情感：不仅要关注每个单词的发音，还要尽力模仿演讲者的语调和情感。这将增强您的语言表达能力，使您的 shadow speech 更加生动自然。
- 重复练习：多次重复这一过程，并尝试用自己的话重新组织和表达这些概念，帮助您加深对内容的理解。
- 互动练习：尝试与朋友或学习小组一起分享您从视频中学到的内容，并使用新词汇进行对话，这将提高您的口头表达能力。
通过这些练习，您不仅能够提高英语口语能力，也能更深刻地理解生态学的复杂性，成为一名更有见识的沟通者。
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。