Glass and rubber blanket evenlessness, with dust, there is no dust belt with varnished and vacuum is not enough, and so on will all the film and plates photoptic plastic seal poor light diffraction by producing, resulting in a printing plate dot issued deficiency, reduced or a holdout spots appear, which affects the reproducibility of the image copy.
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In this disease spots appear on the skin.
患这种病，皮肤上会出现斑点。
In this disease spots appear on the legs.
得了这种病，腿上会出现斑点。
On areas of the skin that have years of frequent and prolonged sun exposure, age spots appear when melanin becomes "clumped" or is produced in particularly high concentrations.
而对于长时间频繁遭受太阳暴晒的皮肤，黑色素便会“集群分布”或产生过多，此时就显示出老人斑。
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