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Why Rainbows Always Appear Opposite the Sun
为什么彩虹总出现在太阳对面？
精读先不看文字，完整听一遍。
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A rainbow forms when sunlight enters a raindrop, bends, reflects off its inner surface, and exits at a specific angle.彩虹形成于阳光射入雨滴后发生折射、在内表面反射，再以特定角度射出的过程。
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This process separates white light into its component colors because each color bends by a slightly different amount.这一过程将白光分解为不同颜色，因为每种颜色的折射程度略有差异。
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Red light exits the drop at about 42 degrees from the original sunlight direction, while violet exits at about 40 degrees.红光以约42度角射出雨滴，紫光则约为40度。
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Since all raindrops at that precise angle relative to your eye and the sun contribute to the arc, you see a circle centered on the antisolar point.由于所有与你的眼睛和太阳成该精确角度的雨滴共同构成圆弧，你看到的彩虹是以反日点为中心的圆。
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That point lies directly opposite the sun — so if the sun is behind you, the rainbow appears ahead.反日点正对太阳方向——因此当太阳在你身后时，彩虹就出现在你前方。
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You can never walk to the end of a rainbow because it moves as you move, always maintaining that 42-degree geometry.你永远无法走到彩虹尽头，因为它会随你移动而移动，始终维持约42度的几何关系。
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From an airplane, under the right conditions, you might even see a full circular rainbow around your shadow.在飞机上，若条件合适，你甚至可能看到围绕自己影子的完整圆形彩虹。
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The brightness and clarity of a rainbow depend heavily on drop size, sunlight intensity, and background contrast.彩虹的亮度与清晰度很大程度上取决于雨滴大小、阳光强度及背景对比度。
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
- A rainbow forms when sunlight enters a raindrop, bends, reflects off its inner surface, and exits at a specific angle. 彩虹形成于阳光射入雨滴后发生折射、在内表面反射，再以特定角度射出的过程。
- This process separates white light into its component colors because each color bends by a slightly different amount. 这一过程将白光分解为不同颜色，因为每种颜色的折射程度略有差异。
- Red light exits the drop at about 42 degrees from the original sunlight direction, while violet exits at about 40 degrees. 红光以约42度角射出雨滴，紫光则约为40度。
④ 懂 · 选一选
⑤ 今天会说这一句
A rainbow forms when sunlight enters a raindrop, bends, reflects off its inner surface, and exits at a specific angle.
⑥ 跟读并录音
A rainbow forms when sunlight enters a raindrop, bends, reflects off its inner surface, and exits at a specific angle.
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：A rainbow forms when sunlight enters a raindrop, bends, reflects off its inner surface, and exits at a specific angle.
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。