This festival takes places biennially .

这个节日每两年有一次。

Since then it has held conferences biennially with sponsorship from host countries and other parties .

自此，主办国和其他人士每两年便赞助举行该会议。

This occurs biennially , as in many fruit trees .

象多种果树那样二年发生一次。

It is the most important professional fair in international auto field , which is held biennially in frankfurt international exhibition center .

该展每两年在法兰克福国际展览中心举办，是国际汽车领域中最重要的专业展览。

The scale that primary endowment insurance expends individual pay , 4 % what must not expend salary under him capture 1997 , the biennially since 1998 increases a percent , 8 % what achieve him capture finally to expend salary .

个人缴纳基本养老保险费的比例，1997年不得低于本人缴费工资的4%，1998年起每两年提高1个百分点，最终达到本人缴费工资的8%。