英汉词典

1. 同时发生的;同时出现的;同步的
    Things which are simultaneous happen or exist at the same time.

simultaneous

    e.g. ...the simultaneous release of the book and the album...
           书和唱片专辑的同步发行
    e.g. The theatre will provide simultaneous translation in both English and Chinese.
           剧院将提供英语和汉语的同声翻译。