Definitely a once in a lifetime opportunity I'm doing here." These boys say they share the special link of being Scouts no matter where they come from.

VOA: special.2010.08.06

And then other people are really excited because it's a once-in-a-lifetime opportunity

而另外一些人真的很兴奋，因为这是一个一生只有一次的机会，

正准备奥运会 - SpeakingMax英语口语达人

He says the jamboree is a once in a lifetime opportunity for him.

VOA: standard.2010.07.31

"Indescribable,unbelievable, everyone should experience this feeling once in a lifetime,".

VOA: standard.2009.08.05

For the fans,it will be a once-in-a-lifetime opportunity to join the celebrations and see the world's greatest football players compete at home in Africa.

VOA: standard.2010.02.10

Many people believe the World Cup will showcase South Africa in a once-in-a-lifetime way, and the new infrastructure is expected to help support the country's growing economy for years to come.

VOA: standard.2010.06.03

I'm going to do this thing. So,that's why I got here." Robert Nephalama,who works at a bank near Johannesburg, wants to make the tournament a once-in-a-lifetime experience for the visitors as well.

VOA: standard.2010.03.26