一回生二回熟

yīhuíshēngèrhuíshú
unfamiliar at first, but well accustomed soon enough (idiom)

CEDICT

Entry Composition

1 一回 yīhuí
  1. chapter one (of a novel etc)
  2. for a while
  3. once
2 生 shēng
  1. to be born
  2. to give birth
  3. life
  4. to grow
  5. raw
  6. uncooked
  7. student
3 二 èr
  1. two
  2. 2
  3. (Beijing dialect) stupid
=4 回 huí
  1. to circle
  2. to go back
  3. to turn around
  4. to answer
  5. to return
  6. to revolve
  7. Hui ethnic group (Chinese Muslims)
  8. time
  9. classifier for acts of a play
  10. section or chapter (of a classic book)
=4 回 huí
  1. to curve
  2. to return
  3. to revolve
=4 回 huí variant of 回 huí
5 熟 shú
  1. ripe; mature
  2. thoroughly cooked; done
  3. familiar; acquainted
  4. experienced; skilled
  5. (of sleep etc) deep; profound
  6. also pr. shóu