科学素养与生活应用·英语30篇（4）

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为何某些云层在夜间发出明亮的绿光

Noctilucent clouds form high in the mesosphere, about 80–85 km above Earth’s surface.
They glow because tiny ice crystals scatter sunlight from below the horizon at twilight.
Their greenish hue comes from excited oxygen atoms emitting light during chemical reactions.
These clouds only appear near polar regions during summer months due to cold temperatures.
Scientists monitor them using satellites and ground-based lidar instruments worldwide.
An increase in their frequency may signal changes in upper-atmosphere water vapor or temperature.
Methane emissions indirectly boost noctilucent cloud formation through oxidation chemistry.
Amateur astronomers often photograph them using DSLR cameras with long exposures.
They serve as natural indicators of atmospheric dynamics and climate-linked processes.
Studying them helps improve models of Earth’s entire atmospheric system.

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

Scientists monitor them using satellites and ground-based lidar instruments worldwide. 科学家通过全球卫星和地面激光雷达设备监测它们。
Methane emissions indirectly boost noctilucent cloud formation through oxidation chemistry. 甲烷排放通过氧化反应间接促进夜光云的形成。
Studying them helps improve models of Earth’s entire atmospheric system. 研究它们有助于改进地球整体大气系统的模型。

这篇中文题目最接近哪一句？为何某些云层在夜间发出明亮的绿光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？夜光云形成于距地表约80–85公里的中间层高空。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 Certain Clouds Glow Bright Green at Night How to cook noodles A maths worksheet

Scientists monitor them using satellites and ground-based lidar instruments worldwide.

Scientists monitor them using satellites and ground-based lidar instruments worldwide.

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：Scientists monitor them using satellites and ground-based lidar instruments worldwide.