1. important =crucial (extremely important),significant(amount or effect large enough to be important) 2. Common=universal, ubiquitous (if something is ubiquitous, it see...
1、致辞：
Directions: Write a speech on the opening of a conference of no less than 120 words. In your speech, you should：1、进行自我介绍，2、详细介绍大会内容，3、结束语。
Good morning...
