I do not remember looking out at the trees, or the sky, or the street after night fell.

我不记得夜晚来临之后看那些树，天空，或者街道。

youdao

I remember how the black plumes of smoke looked against that blue sky, and I remember how that blue lingered for days and weeks and months as I attended countless memorials with empty coffins.

我记得黑色的浓烟是如何反衬着蓝天，我同样记得在我参加无数次只有空棺材的纪念仪式时，这样的蓝色一天天一周周一月月地徘徊着。

youdao

The sky over the clouds, I will remember everything, whether it is happy or sad, especially those deep.

天空飘过白云，我会记住一切，不管是快乐的还是悲伤的，尤其是那些刻骨的。

youdao

With the bright blue sky and warm autumn sun, for a bizarre moment I remember thinking it looked more like a scene from a college brochure than the evacuation of a building under attack.

BBC: Remembering the Pentagon attack