I looked up and saw the sun sinking behind the thick fir wood beside us, and the long dark shadows of the trees stretching downward towards the shore.

我仰望天空，看着太阳从旁边茂密杉林的背后沉下去，拉长的黑色树影往下延伸向河岸。

youdao

The sun was now sinking, a fiery ball of light in the west.

西边的太阳像一个发光的火球正在下沉。

《牛津词典》

The sun was sinking in the west.

太阳西坠。

《牛津词典》

He walked there in the afternoons, reciting to himself and memorising, until he could watch the sinking sun igniting the windows of the city.

ECONOMIST: Samuel Menashe, a New York poet, died on August 22nd, aged 85