要进入大学学习，必须申请参加每年一次的国家入学资格考试。
To gain admission into universities, Iranian applicants must take a national entrance exam given once a year.
来自全世界各地许多国家最优秀的游泳选手参加每年一度的国际游泳比赛。
The best international swimmers take part in annual meets in many parts of the world.
几乎每个人都参加每年举办的“最佳花园竞赛”，而每次都是乔获胜。
Nearly everybody enters for 'the Nicest Garden Competition 'each year, but Joe wins every time.
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