一年一次

The flower show is a yearly event in our town.

我们镇上花展一年举行一次。

The house has an absentee landlord, who visits the property once a year.

栋房子房主不在，一年过来一次。

The examination is held yearly.

种考试一年举办一次。

Etesian Qingdao interenational seawater desalination conference had broad influence and famousness,and it becomes a famous international conference brand step by step in China.

一年一次青岛海水淡化国际会议在业内已有很大影响力度，逐步发展成中国一个国际会议品牌。