以下为句子列表：
英文: To make a mask for a part of a computer chip, a manufacturer first designs the circuitry pattern on a conveniently large scale and converts it into a pattern of opaque metallic film (usually chromium) on a transparent plate (usually glass or silica).
中文: 要做出电脑晶片一部份的光罩，制造者首先在方便操作的大尺度上设计线路，然后把它转录到一片透明板（通常是玻璃或矽石）上不透光的金属薄膜（通常是铬）。
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