習慣自然 [习惯－－]

Jyutping zaap6 gwaan3 zi6 jin4
Pinyin xí guàn zì rán

Definitions (CC-CEDICT)
  1. habit becomes nature (idiom); get used to something and it seems inevitable
  2. second nature
  3. same as 習慣成自然|习惯成自然