the chance etc. of a lifetime是什么意思

词组 the chance etc. of a lifetime 释义 ●the chance, etc. of a lifetimea wonderful opportunity, etc. that you are not likely to get again 终身难得的机遇；千载难逢的机会◆This is your chance to win the trip of a lifetime!这是你赢得旅游机会的大好时机！ 　...