idiom : common saying > be very rare
Contents
Once in nine years
  Explanation: There is little analogy, it is difficult years experience again.
No. 2
  That the years of hard experience.
Translated by Google
shí nián jiǔ bù yù
  Metaphor to grasp the chance
Translated by Google
No. 4
  This is the decade that they did not encounter the things that you can not miss the opportunity to
Translated by Google
No. 5
  十年九不遇
  拼音:shí nián jiǔ bù yù
  解释:1.谓多年难遇到。2.十年有九年遇不上 的事或物...
  事例:这是~的机会,你绝不能错过。
  近义词:千载难逢
English Expression
  1. n.:  be very rare