For example, a one-time crash, as the name implies, may occur once and never appear again.

例如一次性崩溃(one - time crash)，顾名思义，可能只出现一次，并且不会再次出现。

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"This will happen once," Zink said, "and then never again for many, many years."

“这种事情只会发生一次，”津克说，“之后许多年之内都不会再次发生。”

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These are people you meet once, have a great time with or are awe-struck by, and then never see again.

这些人你见过一次，拥有美妙的时光或是他们让你肃然起敬，之后便再没有机会遇见。

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And in making the announcement, President Obama said once again the American drive for a missile shield has never had anything to do with Russia.

VOA: standard.2009.09.17

That's a considerable hurdle -- only one in four mobile apps really engages mobile users, and 26% of all apps downloaded are opened only once and then never used again.

CNN: Phone, tablet users spend more time with apps than Web

"I really like the idea of buying music once and never having to buy it again, " Saffo says.

FORBES: Magazine Article

As for team leader Mr. Fantastic, he's currently dealing with the planet eater Galactus, who has reared his ugly head once again, and that's never good.

CNN: 2011 is bringing a death to the 'Fantastic Four' family