演示的用法和樣例：
例句
-
錄像帶上演示了坐下、起立、屈蹲以及其它健美操練法
Sit-ups, trunk twists, and other calisthenics are demonstrated on the videotape. -
我來(lái)給你演示這臺機器是怎樣操作的。
Let me demonstrate to you how this machine works. -
她畫(huà)了一排由近而遠高度遞減的樹(shù)以演示透視法的規律。
She drew a row of trees receding into the distance to demonstrate the laws of perspective.
