second nature

名词 second nature:

1. acquired behavior that is practiced so long it seems innate

1. After a while, driving becomes second nature to you.
   过不多久，开车的动作就像本能的反应一样了。
2. Custom is a second nature.
   习惯是第二天性。
3. Habit is second nature.
   [谚]习惯是第二天性。