名詞 nightfall:

1. the time of day immediately following sunset
   同義詞：twilight, dusk, gloaming, gloam, evenfall, fall, crepuscule, crepuscle

1. After nightfall we drove slowly along picking our way until we found the right turn.
   入夜后我們開車慢行，小心前進，直到找到需要的轉彎路口。
2. Let's push on it's nearly nightfall.
   咱們繼續(xù)往前走吧--天快黑了。
3. The period of light between dawn and nightfall; the interval from sunrise to sunset.
   白天，白晝黎明和黃昏之間有光的一段時間; 從日出到日落的間隔

night.fall

n.（名詞）
The approach of darkness; dusk.
黃昏：夜幕降臨；傍晚