首先大气平面挡在中间，其中的云、烟、霾会挡住远处星星和近处行星发出的光。

First off, the atmosphere plane gets in the way, what with its clouds and smoke and haze than can block light from distant stars or nearby planets.

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当站台中部发生火灾时，只有机械排烟和挡烟装置配合使用才可以有效地控制烟气。

When a fire occurs at the center of the platform, both the smoke evacuation fan and the smoke blocking wall can effectively control the smoke.

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提出了在楼梯口采用防烟空气幕来代替挡烟垂壁及速度不小于1。

Puts forward a smoke control mode of applying smoke-preventing air curtain substituting for ceiling screen and down air flow with velocity no lower than 1.

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