demonstrationist

例句：

1. 1.He is a renowned demonstrationist who has made many contributions to the field of science.
   他是一位著名的演示者，为科学领域做出了许多贡献。
2. 2. The teacher was a demonstrator who could explain complex concepts in a clear and concise manner.
   这位老师是一位演示者，能够以清晰简洁的方式解释复杂的概念。
3. 3. The student was a demonstrator who demonstrated the new technology to his classmates.
   这位学生是一位演示者，向同学们展示了新技术。