participled

例句：

1. 1. The students participated in the science fair.
   学生们参加了科学博览会。
2. 2. He participated in the marathon and finished third.
   他参加了马拉松比赛，并获得了第三名。
3. 3. She participated in the debate as an expert in environmental law.
   她作为环境法律的专家参加了辩论。