十万个为什么·科学阅读30篇（1）

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为什么白天天空是蓝色，日落时却变红？

Sunlight appears white but contains all visible colors, each traveling as a different wavelength.
Earth’s atmosphere scatters shorter blue and violet wavelengths far more than longer red and orange ones.
During midday, sunlight travels a relatively short path through clean air, so blue dominates what reaches our eyes.
At sunrise or sunset, light must pass through much more atmosphere, scattering away most blue and green light.
Only longer wavelengths—red, orange, and pink—survive the long journey to our location.
Dust, pollution, or volcanic ash can intensify reds by adding extra particles that scatter light even more.
Pilots sometimes report vivid purple or magenta glows when high-altitude ice crystals refract scattered light uniquely.
Astronauts see black space above Earth because there’s no atmosphere to scatter sunlight at all.

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

Only longer wavelengths—red, orange, and pink—survive the long journey to our location. 仅有波长较长的红、橙、粉色光能穿越漫长路径抵达我们所在位置。
Sunlight appears white but contains all visible colors, each traveling as a different wavelength. 阳光看似白色，实则包含所有可见光色，每种颜色对应不同波长。
Astronauts see black space above Earth because there’s no atmosphere to scatter sunlight at all. 宇航员看到地球上方是黑色太空，因为那里没有大气散射阳光。

这篇中文题目最接近哪一句？为什么白天天空是蓝色，日落时却变红？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？阳光看似白色，实则包含所有可见光色，每种颜色对应不同波长。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 Is the Sky Blue During the Day But Red at Sunset? How to cook noodles A maths worksheet

Only longer wavelengths—red, orange, and pink—survive the long journey to our location.

Only longer wavelengths—red, orange, and pink—survive the long journey to our location.

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：Only longer wavelengths—red, orange, and pink—survive the long journey to our location.