Proof: a proof is created by actually printing a few impressions.
打样：打样是通过实际打印一些印张得到的。
Iph: Short for impressions per hour. It normally measures of printing speed.
每小时印数：英文是每小时印数的缩写。一般用它表达印刷速度。
To make a proof is quite costly for the printer because he not only has to make the printing plates but also needs to install them on the machine and make a few impressions in the correct color.
对印刷商来说，打样很贵，因为他不仅要做印版，但还需要把它们安装在机器上，并用正确的颜色作一些印张。
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