科学为什么·英语30篇（1）

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为什么某些珊瑚礁只生长在清澈、温暖、浅层的热带水域？

Coral polyps live in symbiosis with tiny algae called zooxanthellae that need sunlight to photosynthesize.
That is why reefs rarely form deeper than 50 meters—sunlight weakens too much below that depth.
Clear water lets light penetrate farther, while sediment or pollution blocks vital rays and suffocates polyps.
Warmth matters too: most reef-building corals thrive only between 20°C and 28°C year-round.
Cold currents or seasonal drops below 18°C cause coral bleaching and death within days.
Salt levels must stay stable too, since heavy rainfall or river runoff dilutes seawater and harms larvae.
Wave action brings oxygen and plankton but too much force breaks fragile branches apart.
Acidification from CO₂ also weakens calcium carbonate skeletons needed for reef growth.
These narrow requirements explain why reefs cover less than 0.1% of the ocean floor yet host 25% of marine life.
They are living proof that delicate balance enables extraordinary biodiversity.

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They are living proof that delicate balance enables extraordinary biodiversity. 它们是精妙平衡孕育非凡生物多样性的活见证。
Acidification from CO₂ also weakens calcium carbonate skeletons needed for reef growth. 二氧化碳导致的海水酸化也会削弱珊瑚生长所需的碳酸钙骨骼。
Warmth matters too: most reef-building corals thrive only between 20°C and 28°C year-round. 水温同样重要：多数造礁珊瑚仅能在全年20°C至28°C之间繁盛生长。

这篇中文题目最接近哪一句？为什么某些珊瑚礁只生长在清澈、温暖、浅层的热带水域？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？珊瑚虫与一种名为虫黄藻的微小藻类共生，后者需要阳光进行光合作用。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 Some Coral Reefs Grow Only in Clear, Shallow Tropical Waters? How to cook noodles A maths worksheet

Coral polyps live in symbiosis with tiny algae called zooxanthellae that need sunlight to photosynthesize.

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They are living proof that delicate balance enables extraordinary biodiversity.

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用今天的表达，自己说一句。

例子：Coral polyps live in symbiosis with tiny algae called zooxanthellae that need sunlight to photosynthesize.