Everything is a once in a lifetime experience.
Managing in a foreign country will be a once-in-a-lifetime experience that doesn't come along that often
To discover a city is in itself a unique event, but when we have the privilege of sharing it with friends most dear to us, it becomes a once-in-a-lifetime experience.
Training was very extensive, and we dealt with many recoveries from emergencies, and fortunately, participating and observing and existing through the reality of space was a once-in-a-lifetime experience and it was not marred by unexpected hazards or catastrophes.
You spend all this time, as a child, coming up with these fantasy stories, and here I am, sleeping in a treehouse, in the middle of Canyon de Chelly, shooting a Western. That's a bit of a once-in-a-lifetime experience.
Representing Canada as a hockey player is always a tremendous honor, which also comes with a lot of responsibility. Being able to compete and win a gold medal on our home soil made it a once in a lifetime experience. Capping off the best ever performance by not only the Canadian athletes, but also Vancouver and all Canadians, made for an amazing Olympic experience.
or simply:
