進入夜晚；在夜色中。
例句：
1.They kept on discussing the matter far into the night.
這件事情他們壹直討論到深夜。
2.Bob studied hard deep into the night, and then decided to call it a day and went to a bed.
鮑伯學習到深夜，然後決定休息並上床睡覺去了。