每二年一次全国大会或全体理事会议。

There will be a national conference and executive committee meeting every two years.

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一般来说，执行机构的运作，没有大量的维修，因为46%报告说，他们要服务器每隔三年或三年以上，29%的人表示每二年一次。

Generally, actuators operate without a large amount of maintenance, as 46% report that they have to service actuators once every three or more years, and 29% said once per two years.

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理事会每二年举行一次会议。

The Council conferences are convened once every two years.

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