Once each time. Right? I only do one swap potentially, it-- though not one potentially, each time at the end of the loop I do a swap.

每次循环做一次，对么？我其实,就可能做了一次交换，也许并不是可能，每次循环的结束我都得做一次交换。

麻省理工公开课 - 计算机科学及编程导论课程节选

Now we can afford a fairy-tale getaway that we'd only dreamed of once upon a time.

BBC: Daily deal: Vermont fairy-tale

Placing a big one-time bet "cuts the house edge to its bare minimum because it works on your stake only once, " says Anthony Curtis, a one-time professional gambler and president of lasvegasadvisor.com.

FORBES: Magazine Article

So, my own plan for Silicon Dragon events is to not only to hit the Valley but also tap Tsinghua once spring-time arrives.

FORBES: Hanging out with VCs at Tsinghua