1. 非凡的;优秀的;出色的
    If you describe something or someone as extraordinary, you mean that they have some extremely good or special quality.

    e.g. We've made extraordinary progress as a society in that regard...
           在那个方面，我们的社会已经取得了巨大的进步。
    e.g. The task requires extraordinary patience and endurance...
           那项任务需要非凡的耐心和毅力。

2. 非常奇特的;令人惊奇的
    If you describe something as extraordinary, you mean that it is very unusual or surprising.

    e.g. What an extraordinary thing to happen!...
           这事儿真蹊跷！
    e.g. His decision to hold talks is extraordinary because it could mean the real end of the war.
           他作出举行谈判的决定非同寻常，因为这可能意味着战争真的要结束了。

3. （会议）特别的
    An extraordinary meeting is arranged specially to deal with a particular situation or problem, rather than happening regularly.

    e.g. ...at an extraordinary meeting of the sport's ruling body...
           在体育运动管理机构的特别会议上
    e.g. Representatives of the colonies met in an extraordinary congress.
           各殖民地代表在一次特别大会上会面。