夜深 (yè shēn) — late at night; the dead of night

Definition

Examples

• 夜深了，街上一个人也没有。
  yè shēn Le, jiē shàng yí gè rén yě méi yǒu.
  It's late at night; there's no one on the street.
• 夜深的时候，他还在工作。
  yè shēn De shí hou, tā hái zài gōng zuò.
  In the dead of night, he is still working.
• 虽然夜深了，但孩子们还在玩。
  Suī rán yè shēn le, dàn hái zi men hái zài wán.
  Although it's late at night, the children are still playing.