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How Do Coral Reefs Build Massive Structures Over Thousands of Years?
珊瑚礁如何在数千年间建造出庞大的结构？
精读先不看文字，完整听一遍。
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Coral reefs grow slowly as tiny polyps secrete calcium carbonate skeletons that stack up over generations.珊瑚礁由微小的珊瑚虫分泌碳酸钙骨骼，经世代累积缓慢生长。
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Each polyp lives only a few years, but its hard skeleton remains and provides a base for new coral to settle.每只珊瑚虫仅存活数年，但其坚硬骨骼留存下来，为新珊瑚提供附着基底。
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Algae living inside coral tissues supply food through photosynthesis, helping corals build skeletons faster.生活在珊瑚组织内的藻类通过光合作用提供养分，助珊瑚更快构建骨骼。
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Ocean temperature, acidity, and sunlight depth all affect how quickly reefs can expand each year.海水温度、酸度及光照深度均影响珊瑚礁每年的扩展速度。
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Storms, predators, and disease sometimes break parts of the reef, but regrowth usually follows within months.风暴、天敌和疾病有时会破坏部分珊瑚礁，但通常数月内即可再生。
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Fossilized reef layers reveal ancient sea levels and climate conditions from millions of years ago.化石珊瑚礁层揭示了数百万年前的海平面高度与气候状况。
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Modern reefs face threats from warming oceans, which cause corals to expel their colorful algae partners.现代珊瑚礁面临海洋变暖威胁，导致珊瑚驱逐为其提供色彩的共生藻类。
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Despite covering less than 1% of the ocean floor, reefs support nearly 25% of marine species.尽管仅覆盖不到1%的海底面积，珊瑚礁却支撑着近25%的海洋物种。
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Engineers now copy coral growth patterns to design stronger, self-healing concrete materials.工程师正模仿珊瑚生长模式，设计更坚固、可自修复的混凝土材料。
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These underwater cities prove that patience, chemistry, and cooperation can shape entire ecosystems.这些水下城市证明：耐心、化学作用与协作足以塑造完整生态系统。
精读 · 大约 10 分钟
听 → 读 → 学表达 → 懂 → 今天会说这一句 → 跟读录音 → 自己说一句。
③ 学 · 重点表达
- Engineers now copy coral growth patterns to design stronger, self-healing concrete materials. 工程师正模仿珊瑚生长模式，设计更坚固、可自修复的混凝土材料。
- These underwater cities prove that patience, chemistry, and cooperation can shape entire ecosystems. 这些水下城市证明：耐心、化学作用与协作足以塑造完整生态系统。
- Algae living inside coral tissues supply food through photosynthesis, helping corals build skeletons faster. 生活在珊瑚组织内的藻类通过光合作用提供养分，助珊瑚更快构建骨骼。
④ 懂 · 选一选
⑤ 今天会说这一句
Engineers now copy coral growth patterns to design stronger, self-healing concrete materials.
⑥ 跟读并录音
Engineers now copy coral growth patterns to design stronger, self-healing concrete materials.
第一版：录下来、回听、再听标准音。系统打分以后再加。
⑦ 说 · 自己来一句
用今天的表达，自己说一句。
例子：Engineers now copy coral growth patterns to design stronger, self-healing concrete materials.
已记下。连续天数以后会显示在课表里。
陈老师指导
课程开发中，敬请期待。成人和孩子都可以先自学听读、精读。
这边的讲解音轨还在做。想先跟着老师走完固定 30 课，可以去陈老师带读社（和自学通行不是同一份会员）。
课程开发中，敬请期待。