区别如下：
1、wear down v. 磨损; 损耗; 使疲劳; 使厌烦;
Pipe smokers sometimes wear down the tips of their teeth where they grip their pipes.
抽烟斗的人用牙齿咬住烟斗，有时会把齿尖磨平。
2、wear off 逐渐减弱，渐渐消失(主要用来指体力或精神上的感觉)
For many the philosophy was merely a fashion, and the novelty soon wore off.
对许多人来说，哲学只是一种时尚，而新奇的东西很快就消失了。
3、wear out
①穿旧，穿破(用到无法再用为止)
Children wear out their shoes very quickly.
孩子们很快就会穿鞋。
②磨损，磨破
The machine had been worn out seriously because of incorrect operation. Cheap clothes wear out quickly.
由于操作不当，机器严重磨损。便宜的衣服很快磨损。
③使人疲惫不堪(指人，常用于被动语态)
The young people run around kicking a ball, wearing themselves out. He worked all night and wanted to go on working the next day，but we saw that he was completely worn out and persuaded him to stop.
年轻人跑来跑去，穿着自己。他整晚都在工作，并希望第二天继续工作，但我们看到他已经完全疲惫并说服他停下来。
扩展资料：
造句如下：
1、He was wearing a brown uniform
他当时穿着褐色的制服。
2、She wore her hair in a long braid
她梳着一根长辫子。
3、When we drove through the gates, she wore a look of amazement
我们驶过大门时，她流露出惊讶的神情。
4、The shop stocks an extensive range of beach wear
这家商店备有各式各样的沙滩服装。
5、You'll get more wear out of a hat if you choose one in a neutral colour
如果你选个中性颜色的帽子，戴的时间会更多一些。
6、Casual shoes need to wear well
休闲鞋得耐穿。
7、She may give the impression that she wears the trousers but it's Tim who makes the final decisions.
她让人觉得是她当家，但实际上是蒂姆说了算。