These rare creations are called snow rollers, and Mother Nature makes them all by herself. Snow rollersform when wet snow falls on ground that is icy, so snow won't stick to it.
The process of cleaning the rollers, form or plate, and fountain of a press with solvents to remove all ink as required after a day's run, or during a run for ink color changes.
中义在一天工作完毕或更换墨色时，以溶剂清洗辊筒、印版或印刷机的水槽以洗去所残留的印墨。
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Mirrors attached to the rollersform part of an optical system.