n.

1. 论证，证明[U][C][+（that）]
   The teacher gave a demonstration of the law of gravity.

   教师论证了引力定律。

2. 实地示范，实物宣传[U][C]
   teach something by demonstration

   示范教某事

3. 示威，示威运动[C]
   We watched the demonstration from our windows.

   我们从窗口看示威游行。

4. 表示，表露[S]
   a demonstration of joy

   欣喜的表露

n.

1. the action of demonstrating something.
2. a public meeting or march expressing protest or other opinion on an issue.