to slip off ones hand 从手中滑脱
off ones hand
不由自主地
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The division of labour runs thus: the younger Takenaka, Kenji, chisels the cherry-wood blocks to old designs and new ones of his own invention, while his father Seihachi runs off the prints by hand, one by one.
BBC: The art of Japan
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