照相底片 photographic plate
- 首先,把一个照相底片覆盖上感光材料。
First, a photographic plate is coated with a light-sensitive material. - 当时汤博年仅22岁,肩负着比较照相底片的艰巨任务。
Only 22 at the time, Tombaugh was given the laborious task of comparing photographic plates. - 这个过程非常简单,首先,把照相底片用感光材料包裹起来。
The process is very simple. First, a photographic plate is coated with a light sensitive material.
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