“Demonstrate”是一个英文单词，中文含义是“演示，展示，论证”。以下是三个中英文例句：

The professor used visual aids to demonstrate the concept to the class.

教授使用视觉辅助工具向全班展示这个概念。

The company has demonstrated its commitment to environmental sustainability.

该公司已经证明了其对环境可持续性的承诺。

The scientist used experiments to demonstrate the validity of his theory.

科学家通过实验证明了他的理论的正确性。