the chance/experience etc of a lifetimeBESTthe best opportunity, experience etc that you will ever have 千载难逢[终生难得]的机会/经历等 It was the holiday of a lifetime. 这样的假期终生难得。
the chance/experience etc of a lifetime• There is also the chance of a lifetime for the talented teams who win through to the final.• We are offering the experience of a lifetime, and it seems to appeal to people from all over the world.• Jim assured him that hearing me sing was the experience of a lifetime, but Dad wasn't having that.• This was the chance of a lifetime.
→ the chance/experience etc of a lifetime at lifetime(1)