名詞 nighttime:

1. the time after sunset and before sunrise while it is dark outside
   同義詞：night, dark

night.time

n.（名詞）
The time between sunset and sunrise.
夜間：指從日落到日出的一段時(shí)間
adj.（形容詞）
Occurring in or appropriate for use during the night:
夜間發(fā)生的：發(fā)生在夜晚的或適用于夜晚的：
例句：
nighttime activities; nighttime attire.
夜間活動(dòng)；夜間服裝