底 版 Negative(original negative or positive) 用照相机直接拍摄的负片，或指彩色反转片等的胶片。针对翻印的胶片而用的术语，亦称原片。
adj. negative
misc. photographic plate
... 日光照相底版纸 negativeheliographicpaper ; heliographic 底版，基底 BP Base Plate 射线照相底版 radiographicplate ...
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本文对荫罩母版进行了初步探讨，并对原始母版、工作母版和工作底版的设计与制作进行了具体的论述。
This paper investigates the mask master initiatively and discusses the design and manufacture method of the primary master, working master and working plate in concrete terms.
这只箱子的旁边是一块巨大的拼图底版，有一部分已经拼上了拼版——这就是过去。
Beside it lies a huge board, partially filled with bits of the overall puzzle — that is the past.
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