a once-in-lifetime journey
一次千载难逢的旅行
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But with some divine intervention, he's given a second chance when he's offered a once-in-a-lifetime journey of discovery.
但一些神的介入，他给予第二次机会时，他提供了一个千载难逢的一次探索，生命之旅。
youdao
For better or worse, the future of Antarctica may depend on how many people choose to save up and make the once-in-a-lifetime journey.
CNN: Antarctica: March of the tourists
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