- 证明，论证，证实：
The philosopher demonstrated a philosophical principle.
那位哲学家论证了一条哲学原理。
The attorney demonstrated that the witness was lying.
那位律师证明证人在撒谎。
- (用实例、标本、实验等)说明，解释，表明；教：
to demonstrate the force of gravity by dropping an object
通过落体说明地球引力
The instructor demonstrated the proper way to sew in a zipper.
教员说明缝入拉链的正确方法。
- 显示出(品质、特征等):
The hero demonstrated his courage by his actions in battle.
战斗英雄的勇敢表现在战场上。
The soldier demonstrated great courage in saving the drowning child.
战士在抢救溺水孩子时表现得很勇敢。
- 表露(情感等)：
She demonstrated her anger by slamming a door.
她砰地关上门表示她的愤怒。
- 示范操作(机器、仪器、产品等)；宣传(产品)等的优点(或用法)，演示，显示：
She demonstrated a new car to customers in the department store.
她在百货公司向顾客示范驾驶一辆新汽车。
She demonstrated how the computer works.
她演示计算机的使用方法。