十万个为什么·科学启蒙30篇（2）

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北极光为何在夜空中舞动？

The Northern Lights, or auroras, happen when charged particles from the Sun hit Earth’s atmosphere.
These solar winds travel along Earth’s magnetic field lines toward the North and South Poles.
When particles collide with oxygen and nitrogen gases, they release colorful light energy.
Green auroras come from oxygen at lower altitudes, while red appears higher up.
Purple and blue lights result from nitrogen molecules being excited during intense solar storms.
Auroras look like flowing curtains because magnetic fields guide particle paths in wavy patterns.
Their brightness and shape change with solar activity, which follows an 11-year cycle.
Cameras often capture more color than our eyes see, especially in dark conditions.
People near the Arctic Circle see them most often, but strong storms make them visible farther south.
Studying auroras helps scientists understand space weather and protect satellites and power grids.

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

When particles collide with oxygen and nitrogen gases, they release colorful light energy. 粒子与氧和氮气体碰撞时，会释放出五彩的光能。
Green auroras come from oxygen at lower altitudes, while red appears higher up. 绿色极光来自低空的氧原子，红色则出现在更高处。
Their brightness and shape change with solar activity, which follows an 11-year cycle. 其亮度和形态随太阳活动变化，而太阳活动遵循11年周期。

这篇中文题目最接近哪一句？北极光为何在夜空中舞动？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？北极光（极光）是太阳带电粒子撞击地球大气层时产生的。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） What Causes the Northern Lights to Dance Across the Sky? How to cook noodles A maths worksheet

When particles collide with oxygen and nitrogen gases, they release colorful light energy.

When particles collide with oxygen and nitrogen gases, they release colorful light energy.

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：When particles collide with oxygen and nitrogen gases, they release colorful light energy.