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Why Lightning Often Strikes Tall Trees but Rarely Damages Their Bark
为何闪电常击中高树却很少损伤其树皮
精读先不看文字，完整听一遍。
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Lightning favors tall trees because their height reduces the insulating air gap between storm clouds and ground.闪电偏爱高大的树木，因为其高度缩短了雷暴云与地面之间的绝缘空气间隙。
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Tree sap, rich in water and minerals, conducts electricity better than dry wood, guiding current along the cambium layer.树液富含水分和矿物质，导电性优于干燥木材，能将电流沿形成层引导。
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The rapid heating of sap vaporizes moisture instantly, creating steam that explodes outward—but usually just under the bark.树液迅速受热，水分瞬间汽化成蒸汽并向外爆炸——但通常仅发生在树皮下方。
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This ‘bark stripping’ effect removes outer layers while leaving vital vascular tissue intact beneath moist inner wood.这种‘剥皮’效应会剥离树皮外层，而湿润的内层木材下维管组织仍完好无损。
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Oaks and pines survive more strikes than maples because their thicker, furrowed bark traps moisture longer near conductive tissues.橡树和松树比枫树更能承受雷击，因其更厚、沟壑更深的树皮能长时间锁住水分，靠近导电组织。
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Scientists measure voltage gradients across trunks to map safe pathways lightning avoids during repeated discharges.科学家通过测量树干上的电压梯度，绘制出闪电在多次放电中避开的安全路径。
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Some trees develop shallow root networks that dissipate charge into soil faster, reducing internal damage risk.一些树木发育出浅层根系，能更快将电荷导入土壤，降低内部损伤风险。
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Foresters use lightning scars to estimate tree age and historical storm frequency in old-growth forests.林务员利用雷击疤痕估算古树林中树木的年龄及历史风暴发生频率。
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Modern lightning rods borrow this principle by offering low-resistance paths that protect surrounding vegetation.现代避雷针借鉴这一原理，提供低电阻通路，保护周边植被。
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Understanding this natural protection helps design safer urban tree planting strategies near power infrastructure.理解这种天然防护机制，有助于设计靠近电力设施的城市植树安全策略。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- Modern lightning rods borrow this principle by offering low-resistance paths that protect surrounding vegetation. 现代避雷针借鉴这一原理，提供低电阻通路，保护周边植被。
- Understanding this natural protection helps design safer urban tree planting strategies near power infrastructure. 理解这种天然防护机制，有助于设计靠近电力设施的城市植树安全策略。
- Scientists measure voltage gradients across trunks to map safe pathways lightning avoids during repeated discharges. 科学家通过测量树干上的电压梯度，绘制出闪电在多次放电中避开的安全路径。
④ 懂 · 选一选
⑤ 今天会说这一句
Modern lightning rods borrow this principle by offering low-resistance paths that protect surrounding vegetation.
⑥ 跟读并录音
Modern lightning rods borrow this principle by offering low-resistance paths that protect surrounding vegetation.
第一版：录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达，自己说一句。
例子：Modern lightning rods borrow this principle by offering low-resistance paths that protect surrounding vegetation.
已记下。连续天数以后会显示在课表里。
陈老师指导
课程开发中，敬请期待。成人和孩子都可以先自学听读、精读。
这边的讲解音轨还在做。想先跟着老师走完固定 30 课，可以去陈老师带读社（和自学通行不是同一份会员）。
课程开发中，敬请期待。