Backuproller: roller which backs up the impression roller FOR additional pressure in gravure printing.
加压辘：在照相凹版印刷机上，给予压力圆筒额外压力的辊辘。
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In 2003, an American amusement park operator was killed when his hair and arm got caught on a roller coaster car, pulling him up as high as 12 metres before he fell, back-first, onto a fence.