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Why Do Fireflies Glow Without Getting Hot?
为什么萤火虫发光却不发热?
精读先不看文字,完整听一遍。
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Fireflies produce light through bioluminescence—a cold chemical reaction inside living organisms, unlike burning or electric bulbs.萤火虫通过生物发光产生光——这是一种发生在活体内的冷化学反应,不同于燃烧或电灯发光。
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Their light comes from luciferin reacting with oxygen, triggered by the enzyme luciferase and powered by ATP energy.它们的光来自荧光素与氧气的反应,该反应由荧光素酶触发,并由ATP提供能量。
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Over 90% of the energy becomes visible light, with almost no infrared waste—so it’s called ‘cold light’.超过90%的能量转化为可见光,几乎不产生红外热损耗,因此被称为‘冷光’。
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This efficiency far surpasses incandescent bulbs, which waste 90% of energy as heat rather than light.这种效率远超白炽灯,后者90%的能量以热量形式浪费,而非转化为光。
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Each firefly species has unique flash patterns, helping mates recognize each other in crowded summer evenings.每种萤火虫都有独特的闪光模式,帮助配偶在夏夜密集的种群中相互识别。
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Some female fireflies mimic others’ signals to lure and eat males—a deadly case of deceptive communication.某些雌性萤火虫会模仿其他种类的闪光信号,诱捕并捕食雄性,这是欺骗性通讯的致命案例。
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Scientists study luciferase to develop medical imaging tools, like tracking cancer cells using bioluminescent markers.科学家研究荧光素酶,以开发医学成像工具,例如利用生物发光标记追踪癌细胞。
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Pollution, habitat loss, and artificial light now threaten many firefly populations worldwide—reducing both beauty and science.污染、栖息地丧失和人工光污染正威胁全球众多萤火虫种群——既削弱自然之美,也损害科研价值。
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
- Scientists study luciferase to develop medical imaging tools, like tracking cancer cells using bioluminescent markers. 科学家研究荧光素酶,以开发医学成像工具,例如利用生物发光标记追踪癌细胞。
- Fireflies produce light through bioluminescence—a cold chemical reaction inside living organisms, unlike burning or electric bulbs. 萤火虫通过生物发光产生光——这是一种发生在活体内的冷化学反应,不同于燃烧或电灯发光。
- This efficiency far surpasses incandescent bulbs, which waste 90% of energy as heat rather than light. 这种效率远超白炽灯,后者90%的能量以热量形式浪费,而非转化为光。
④ 懂 · 选一选
⑤ 今天会说这一句
Scientists study luciferase to develop medical imaging tools, like tracking cancer cells using bioluminescent markers.
⑥ 跟读并录音
Scientists study luciferase to develop medical imaging tools, like tracking cancer cells using bioluminescent markers.
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:Scientists study luciferase to develop medical imaging tools, like tracking cancer cells using bioluminescent markers.
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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。