空气渐冷，光线渐敛，把天空变得黑暗。

The air grows colder, the light grows dim, darkening the sky above.

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引擎的节流阀被打开了，火车提速来弥补落下的时间。 铁轨的咔哒声渐行渐远，最后一点光线闪闪烁烁地消失在远处。

And now the engineer pulled out the throttle-valve to make up for lost time, and the clatter of the train faded into a distant roar, and its lights began to twinkle into indistinctness.

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月亮渐亏，而在如此暗弱的光线下，很难看见敌人。

The moon was waning, and in such a waning light, it is very difficult to see the enemy.

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