The earth is surrounded by a layer of air called the atmosphere.
在地球外面包围着一层空气，叫做大气层。（主语转换为状语）
Why can a hydrofoil move on a layer of air?
为什么气垫船能靠后方的气流移动?。
Surrounding the earth is a layer of air of unknown thickness.
环绕地球的是一层空气，其厚度尚未为人所知。
Seen from space, the Earth's atmosphere is a thin blue layer of air.
从太空上看，地球的大气层是一个薄薄的蓝色的空气层。
The key is to keep the pelt's air layer intact.
关键是要保持皮毛空气层的完整性。
The top of the layer of hot air ACTS like a mirror.
热空气层的顶部起镜子的作用。
The daily change of air humidity in surface layer is contrary to that of temperature.
近地层空气湿度的日变化与温度相反。
The three-layer air supply system is common to the new type alkali recovery boiler.
新型碱炉一般采用三层供风系统。
Blue sky is often shadowed by a layer of white foggy air.
阴云天气的增加；兰兰天空被一层白雾状气体蒙蒙；
Blue sky is often shadowed by a layer of white foggy air.
阴云天气的增加；兰兰天空被一层白雾状气体蒙蒙；
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