This competition, to me, is a chance of lifetime.

对于我来说，这次比赛是个千载难逢的机会。

youdao

It was the chance of a lifetime.

这是千载难逢的机会。

youdao

A woman's lifetime chance of getting breast cancer is about one in eight.

女性一生中患乳腺癌的几率大概是八分之一。

youdao

For him, coming to America to attend George Washington University was the chance of a lifetime.

VOA: special.2009.01.28

Stepping on such hallowed ground is a chance of a lifetime for fans on the annual pilgrimage.

BBC: News | UK | Name your Fab Four tops and flops

The organisers are billing it as "a chance of a lifetime" to perform in the Millennium Dome's central attraction to audiences of up to 12, 000 a show, six times a day.

BBC: News | Entertainment | It could be you at the Millennium show

When McPherson wasn't answering questions about Katie Holmes' guest turn on sophomore drama Eli Stone, he focused on the fall's two newcomers: Life on Mars, a British remake about a modern-day police detective who wakes up 35 years in the past, and Opportunity Knocks, a chance-of-a-lifetime game show from star Ashton Kutcher.

FORBES: Jimmy Kimmel Live