sunset/'sʌnset/

n. the time when the sun disappears and night begins or the disappearing of the sun at this time

n. [U; C] 日落（时分）；夕阳西下：The park is closed at sunset. 这个公园日落时闭园。

◇This is the best place to watch the sunset. 这里是看夕阳西下最好的地方。

构词sun + set（太阳落下）