例： The president took the unprecedented step of summoning all the state governors to a conference on education.
总统采取了前所未有的举措，召集所有的州长参加一次教育讨论会。
例： the Alternative Energy conference.
可替代能源讨论会。
例： Last weekend the Roman Catholic Church in Scotland held a conference, attended by 450 delegates.
上周末，苏格兰天主教会举行了一次会议，有450名代表参加。