十万个为什么·科学启蒙30篇（4）

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为什么深海颜色迅速变暗

Sunlight contains all colors, but water absorbs longer wavelengths—red, orange, yellow—first, within the top 50 meters.
By 100 meters, green light dominates; at 200 meters, only dim blue remains, and infrared vanishes completely.
Particles and dissolved organic matter scatter light further, reducing clarity and intensity faster in coastal zones.
Most deep-sea animals either produce their own light (bioluminescence) or have ultra-sensitive eyes adapted to near-total darkness.
Submersibles carry powerful lights because natural illumination drops to less than 1% of surface levels below 200 m.
Photosynthetic organisms like phytoplankton vanish below 1000 meters, where no usable light remains for energy conversion.
Scientists use spectral sensors to map ‘euphotic depth’—the deepest layer receiving enough light for photosynthesis.
This rapid attenuation is why deep-ocean photography requires artificial lighting and careful white-balance calibration.

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

This rapid attenuation is why deep-ocean photography requires artificial lighting and careful white-balance calibration. 正是这种快速衰减，使得深海摄影必须依赖人工照明，并精细校准白平衡。
Scientists use spectral sensors to map ‘euphotic depth’—the deepest layer receiving enough light for photosynthesis. 科学家利用光谱传感器测定‘透光层深度’——即仍能满足光合作用所需光照的最深水层。
Sunlight contains all colors, but water absorbs longer wavelengths—red, orange, yellow—first, within the top 50 meters. 阳光包含所有颜色，但水会首先吸收较长波长的光——红、橙、黄光——在表层50米内即大幅衰减。

这篇中文题目最接近哪一句？为什么深海颜色迅速变暗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？阳光包含所有颜色，但水会首先吸收较长波长的光——红、橙、黄光——在表层50米内即大幅衰减。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 Deep Ocean Light Fades Rapidly How to cook noodles A maths worksheet

This rapid attenuation is why deep-ocean photography requires artificial lighting and careful white-balance calibration.

This rapid attenuation is why deep-ocean photography requires artificial lighting and careful white-balance calibration.

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：This rapid attenuation is why deep-ocean photography requires artificial lighting and careful white-balance calibration.