十万个为什么·科学阅读30篇（4）

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萤火虫如何发出不发热的冷光？

Fireflies glow through a chemical reaction called bioluminescence, not combustion.
Their light comes from luciferin, a molecule that reacts with oxygen inside living cells.
This reaction is powered by ATP—the energy currency found in all living organisms.
An enzyme named luciferase speeds up the process so light emits almost instantly.
Over 90% of the energy becomes visible light, while less than 10% turns into heat.
That makes firefly light extremely efficient compared to incandescent bulbs, which waste most energy as heat.
The color of their glow depends on slight changes in luciferase structure and pH levels.
Some species even adjust flash patterns to attract mates or warn predators.
Unlike electric lights, bioluminescence requires no external power source or wiring.
Scientists study these systems to design safer medical imaging tools and eco-friendly lighting.

听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。

Fireflies glow through a chemical reaction called bioluminescence, not combustion. 萤火虫发光依靠的是生物发光，而非燃烧。
Unlike electric lights, bioluminescence requires no external power source or wiring. 与电灯不同，生物发光无需外部电源或线路。
Some species even adjust flash patterns to attract mates or warn predators. 某些种类甚至通过调整闪光模式来求偶或警示天敌。

这篇中文题目最接近哪一句？萤火虫如何发出不发热的冷光？一次学校运动会的通知一份超市购物清单

课文第一句的意思更接近？萤火虫发光依靠的是生物发光，而非燃烧。今天学校放假了。请把窗户打开。

这一课主要在讲什么？（看英文标题） How Do Fireflies Produce Cold Light Without Burning? How to cook noodles A maths worksheet

Fireflies glow through a chemical reaction called bioluminescence, not combustion.

Fireflies glow through a chemical reaction called bioluminescence, not combustion.

第一版：录下来、回听、再听标准音。系统打分以后再加。

用今天的表达，自己说一句。

例子：Fireflies glow through a chemical reaction called bioluminescence, not combustion.