He is a volcano expert, so I thought he might be teaching your class.
他是研究火山方面的专家，所以我想他可能在给你们上课。
2
The form and style are very familiar, and best of all, you are the world-classexpert on the subject of YOU.
你对形式和风格非常熟悉，最重要的是，你是 YOU 这个领域的世界级专家。
3
In addition, the majority suggested that judges at the class certification stage can probably also make gatekeeping decisions about whether expert witnesses are engaging in junk science.