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1·It's held once every four years.

它的每四年举行一次。

2·Once every four years.

每隔四年。

3·The World Cup is held once every four years.

世界杯每四年举办一次。

4·The Olympic Games take place once every four years.

奥林匹克运动会每4年举行一次。

5·Olympic Games are held in different countries once every four years.

奥运会在不同的国家每四年举行一次。

6·Annie: Yes. The Olympic Games is held once every four years. The opportunity is rare.

安妮：对了，四年一后的奥运会，机会多么难得呀。

7·February 29 is not a holiday, but it is still special because it only comes once every four years.

二月二十九日不是假日，但因为它每四年才来一次，所以依然十分特别。

8·Inauguration Day occurs once every four years, about two and a half months after the national election.

就职日发生每四年一次，约两个半月后的全国选举。

9·A common festival for all football fans all over the world, the football world Cup, is held once every four years.

足球世界杯四年举办一次，是全世界球迷的共同节日。

10·It has been held once every four years. If it is canceled for some reasons, the game will still be counted orderly.

每四年举行一次，如因故不能举行，后数还按顺序计算。