十万个为什么·科学阅读30篇（4）

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香蕉在紫外灯下为什么会发蓝光？

Bananas emit faint blue fluorescence when exposed to UV light due to chlorophyll breakdown products.
As bananas ripen, chlorophyll degrades into fluorescent catabolites that absorb UV and re-emit blue light.
These compounds accumulate in the peel’s cell walls and remain stable longer than the original pigment.
The bluer the glow, the more advanced the ripening stage—even before yellow color fully develops.
Other fruits like pears and apples show weaker versions, but banana fluorescence is unusually strong and consistent.
Scientists use this property to monitor fruit quality non-invasively during transport and storage.
UV-induced fluorescence doesn’t harm the fruit or affect taste, nutrition, or safety.
It’s visible only under blacklight; normal sunlight contains too much competing visible light to see it.
This natural phenomenon inspired new biosensors that detect plant stress or disease early.
Interestingly, some insects see UV light and may use banana fluorescence to locate ripe fruit.

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

UV-induced fluorescence doesn’t harm the fruit or affect taste, nutrition, or safety. 紫外线激发的荧光不会损害果实，也不影响其口感、营养或安全性。
Scientists use this property to monitor fruit quality non-invasively during transport and storage. 科学家利用这一特性，在运输和储存过程中无损监测水果品质。
This natural phenomenon inspired new biosensors that detect plant stress or disease early. 这一自然现象启发了新型生物传感器的开发，可用于早期检测植物胁迫或病害。

这篇中文题目最接近哪一句？香蕉在紫外灯下为什么会发蓝光？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？香蕉暴露在紫外线下会发出微弱的蓝光荧光，这是叶绿素分解产物所致。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） Why Do Bananas Glow Blue Under Ultraviolet Light? How to cook noodles A maths worksheet

UV-induced fluorescence doesn’t harm the fruit or affect taste, nutrition, or safety.

UV-induced fluorescence doesn’t harm the fruit or affect taste, nutrition, or safety.

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：UV-induced fluorescence doesn’t harm the fruit or affect taste, nutrition, or safety.