1、The protesters organized a peaceful demonstration against racial discrimination.
抗议者组织了一场和平的反种族歧视示威活动。

2、He gave a demonstration of his new invention to the audience.
他向观众展示了他的新发明。

3、The experiment provided a clear demonstration of the theory's validity.
这个实验明确证明了这个理论的有效性。