First, a photographic plate is coated with a light-sensitivematerial.
首先,把一个照相底片覆盖上感光材料。
2
The process is very simple. First, a photographic plate is coated with a light sensitivematerial.
这个过程非常简单,首先,把照相底片用感光材料包裹起来。
3
First, the photographic plate is coated with a light-sensitivematerial. The plate is positioned so that the image received by the telescope is recorded on it.