A layer of cold air remains near the ground as smoke and fumes pour into it.
当烟尘和微粒拜谢到空气中以后，有一层冷空气仍然在贴近地面。
The seismic stress amplitude of the lower layer is larger than that of the upper layer under near-field ground motion, and under far-field ground motion the condition is opposite.
在近场地震动作用下双层隧道下层的地震应力幅值要比上层的地震应力幅值大，在远场地震动作用下则相反；
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