participation certificates

例句：

1. 1.The student participated in the science fair and won first prize.
   这个学生参加了科学博览会并获得了一等奖。
2. 2. The team needs to submit a participation certificate before they can enter the competition.
   在进入比赛之前，团队需要提交一份参与证明。
3. 3. The teacher asked the students to present their participation certificates at the assembly.
   老师要求学生们在集会上展示他们的参与证明。