n.夜间;
adj.夜间发生的;
例句:
Most of them had never seen an owl even at nighttime.
他们中的很多人从未在夜晚见过猫头鹰.
I don't eat at nighttime unless I am very hungry.
夜间我不吃东西,除非我很饿.
The nighttime air was comfortably cool.
夜晚的空气清新宜人.