2N-COUNT 观看者;观察者 A viewer is someone who is looking carefully at a picture or other interesting object. 观看者;观察者
... the relationship between the art object and the viewer.
艺术品与其观赏者之间的关系
3N-COUNT (看幻灯片的)观片器,看片器 A viewer is a device shaped like a box with a lens in one side. It is used for looking at transparent colour photographs. (看幻灯片的)观片器,看片器
This special viewer is simple to use and comes with 70 full-colour slides.