by night

phr

• ① 夜间(←→by day)
  • He sleeps by day [during the day] and works by night.他白天睡觉,夜间工作。
  • Hong Kong is a different city by night.香港在夜里是个不同的城市。

• ② 趁着夜晚
  • They attacked the enemy by night.他们趁着夜晚攻击敌人。