理所當然

理所当然
lǐsuǒdāngrán
  1. as it should be by rights (idiom); proper and to be expected as a matter of course
  2. inevitable and right

CEDICT

Entry Composition

1 理 lǐ
  1. texture
  2. grain (of wood)
  3. inner essence
  4. intrinsic order
  5. reason
  6. logic
  7. truth
  8. science
  9. natural science (esp. physics)
  10. to manage
  11. to pay attention to
  12. to run (affairs)
  13. to handle
  14. to put in order
  15. to tidy up
2 所 suǒ
  1. actually
  2. place
  3. classifier for houses, small buildings, institutions etc
  4. that which
  5. particle introducing a relative clause or passive

classifier: 個
3 當然 dāngrán
  1. only natural
  2. as it should be
  3. certainly
  4. of course
  5. without doubt