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 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。
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 top of the layer of hot air ACTS like a mirror.
热空气层的顶部起镜子的作用。
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