process colour
二个颜色，可以是专色，也可以是印刷四原色中的颜色。
Two colors, can be a color, can also be printed 4-color process in color.
youdao
洋红：减法原色之一。是四色彩印所用的颜色。亦称四色红。
Magenta: One of the subtractive primary colours. It is used in four-colour process printing. Also referred to as process red.
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