1. 外观;外部
The exterior of something is its outside surface.
exterior
e.g. In one ad the viewer scarcely sees the car's exterior...
在一则广告中，观众几乎看不到汽车的外观。
e.g. The exterior of the building was elegant and graceful.
这座大厦外观雅致而优美。
2. （尤指与实际性格相差甚远的）外表，外貌，外在
You can refer to someone's usual appearance or behaviour as their exterior, especially when it is very different from their real character.
e.g. According to Mandy, Pat's tough exterior hides a shy and sensitive soul.
据曼迪说，帕特彪悍的外表下隐藏着一颗害羞且敏感的心。
3. 外面的;外部的
You use exterior to refer to the outside parts of something or things that are outside something.
e.g. The exterior walls were made of pre-formed concrete.
外墙用的是预制混凝土。
e.g. ...the oven's exterior surfaces.
烤箱的外表面