Freestyle, butterfly, back stroke and breast stroke are four commonly seen strokes in swimming competition.

自由泳、蝶泳、仰泳和蛙泳是游泳比赛中常见的四种泳姿。

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The competition only happens every four years, and the last time the team went, they won the third place in the nation.

这个比赛每四年举行一次。上次这个队去参赛的时候，他们获得了全国第三名。

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Following four hours of grueling competition and eight laborious costume changes, it's time to determine the winner.

接着四小时的折磨人的竞赛和七八次费力的更换装束，现在是决定获胜者的时刻。

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The Race to the Top competition will look for states and local school systems with effective reforms in four areas.

VOA: special.2009.07.30

The 31-year-old dominated the competition and four of her efforts would have been good enough for victory.

CNN: Bolt makes history with 200m triumph at London Olympics

Overall, the 10 most-expensive airports for air travel include six "fortress" hubs dominated by one airline and four small cities without much fare competition.

WSJ: Why It Costs So Much to Fly From These Airports

It is the fifth successive season they had made the last four of the FA Cup - equalling the competition record - and they have now made the final four years out of five.

BBC: Arsenal 3-0 Blackburn