A chemist takes a sample of whiskey from a VAT, determines that it is 90 proof.
化学家要确定一大桶威士忌酒是否是90度，也只能从桶中抽取一些样品加以化验。
In traditional way, a proof is to provide a sample or reference, then press operator try to adjust the ink film thickness and dot gain to match it or as close as possible.
对于传统方式，样张是作为参考的依据。然后机长通过调整墨层厚度以及控制网点扩大来尽量接近样张颜色。
In traditional way, a proof is to provide a sample or reference, then press operator try to adjust the ink film thickness and dot gain to match it or as close as possible.
对于传统方式，样张是作为参考的依据。然后机长通过调整墨层厚度以及控制网点扩大来尽量接近样张颜色。
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