1. image is viewed through an eyepiece perpendicular to main axis. 
   通过垂直于主轴的目镜观察物体。
2. large convex lens produces image that is viewed through the eyepiece. 
   通过目镜观察物体图像的大的凸透镜。
3. The glass front of a cathode-ray tube upon which the image is displayed. 
   显像管阴极射线管的玻璃前端，图象显示在其面
4. an image distorted in such a way that it becomes visible only when viewed in a special manner. 
   被扭曲的形象，这种扭曲的形象只有以一种特殊的方式去观察才能变的明显。
5. An image that appears distorted unless it is viewed from a special angle or with a special instrument. 
   失真图象，变形影象除非从特别角度或用特殊仪器观察，否则所呈现的图象一般是扭曲的

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