at dead of night

例句：

1. 1. She was so tired thatshe fell asleep at the dead of night.
   她太累了，以至于在半夜就睡着了。
2. 2. The movie ends at the midnight mark.
   电影在午夜结束。
3. 3. He decided to stayup late at the dead of night tofinish his work.
   他决定在深夜熬夜完成他的工作。