科学为什么·英语30篇（1）

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为什么深海生物会发出不同颜色的光？

Most deep-sea animals produce blue or green bioluminescence because those wavelengths travel farthest in seawater.
Red light vanishes within the first 10 meters, so some fish evolved red photophores to see prey invisibly.
Certain shrimp eject glowing clouds in orange or yellow to confuse predators in midwater zones.
The color depends on luciferin chemistry, enzyme structure, and whether filters modify emitted light.
Some squid use counter-illumination—matching downwelling light with ventral glow—to hide from hunters below.
Tiny symbiotic bacteria inside anglerfish lures emit steady light controlled by the host’s blood flow.
Scientists discovered new fluorescent proteins in jellyfish that absorb blue light and re-emit red or orange.
Depth, pressure, and available prey species all shape which colors evolve for camouflage or attraction.
Unlike surface reflection, bioluminescent color is metabolically expensive and tightly regulated.
Studying these lights helps engineers design better medical imaging tools and low-energy sensors.

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

Unlike surface reflection, bioluminescent color is metabolically expensive and tightly regulated. 与表层反射不同，生物发光的颜色代谢成本高，且受严格调控。
Some squid use counter-illumination—matching downwelling light with ventral glow—to hide from hunters below. 一些乌贼采用反荫蔽策略——用腹部发光匹配自上而下的环境光，从而躲避下方的捕食者。
Studying these lights helps engineers design better medical imaging tools and low-energy sensors. 研究这些发光机制有助于工程师设计更优的医学成像工具和低功耗传感器。

这篇中文题目最接近哪一句？为什么深海生物会发出不同颜色的光？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？多数深海动物发出蓝光或绿光，因为这两种波长的光在海水中传播距离最远。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 Deep-Sea Creatures Glow in Different Colors? How to cook noodles A maths worksheet

Unlike surface reflection, bioluminescent color is metabolically expensive and tightly regulated.

Unlike surface reflection, bioluminescent color is metabolically expensive and tightly regulated.

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：Unlike surface reflection, bioluminescent color is metabolically expensive and tightly regulated.