推荐回答（1个）
这主要看说话者的意思，It's getting dark.当然你愿意的话，也可以是：
The sun was setting, and the room was getting darker and darker. 太阳下山了，屋里渐渐昏暗起来。
It was getting darker and darker and he lost his way in the forest. 天渐渐地黑了，他们在森林里迷了路。
The sky is growing darker and darker. 天空越来越暗了。
It is getting darker and darker, so we must be off. 天越来越黑了，因而我们必须离开。
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