好奇为什么 · 4-8 岁

萤火虫为什么会发光

小小腹部里的冷光信号

科普启蒙约 5 分钟4-8 岁中英双语

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夏夜，小雨和妈妈坐在草地边。草丛里一闪一闪。“萤火虫为什么会发光？”

On a summer night, Xiaoyu sits beside a meadow with Mother. Fireflies blink in the grass. “Why do fireflies glow?”

夏夜，小雨和妈妈坐在草地边。草丛里一闪一闪。“萤火虫为什么会发光？”

On a summer night, Xiaoyu sits beside a meadow with Mother. Fireflies blink in the grass. “Why do fireflies glow?”

妈妈轻声说：“我们安静看，不抓它们。答案藏在它的腹部。”

Mother whispers, “Let’s watch quietly and not catch them. The answer is inside their abdomens.”

萤火虫腹部有个发光器，里面有荧光素和荧光素酶。

A firefly’s abdomen has a special light organ containing luciferin and luciferase.

氧气也参加进来。在荧光素酶帮助下，它们发生化学反应。

Oxygen joins in too. With luciferase helping, the substances take part in a chemical reaction.

这场反应把大部分能量变成光，只变出很少的热。

This reaction turns most of its energy into light, with only a tiny amount becoming heat.

这种光叫生物发光。不同种萤火虫用不同节奏闪光，交流、寻找伙伴。

This is called bioluminescence. Different firefly species use different flashing rhythms to communicate and find mates.

小雨屏住呼吸观察：“原来，光来自身体里的化学反应！”

Xiaoyu holds their breath and watches. “So the light comes from a chemical reaction inside the body!”

小雨抬头问：“那向日葵为什么朝着太阳呢？”

Xiaoyu looks up and asks, “Then why do sunflowers turn toward the sun?”

萤火虫发光器里的荧光素在荧光素酶、氧气等参与下发生反应，把大部分能量变成光，常用闪光与同类交流、寻找伴侣。

A reaction involving luciferin, luciferase and oxygen makes fireflies’ cool light, often used to communicate with other fireflies.

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