The slitting device is by optimized designed with the feature of automatic knife sharpening system. The grinding wheel can grind the blades accurately according to the slitting time.

切割系统经过优化设计，配有自动磨刀系统，砂轮可自动根据切割次数来确定研磨刀片。

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This knife needs sharpening.

这把刀需要磨了。

《牛津词典》

We can be much more effective if we spend our time and focused energy sharpening one knife, and move on to another knife only when the first one has reached its desired outcome.

如果我们花时间和集中精力来磨快一把刀，只有当第一把磨刀满意的程度后再磨另一把的话，那么效率就会大大增加。

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The young artist award went to 28-year-old Sertan Saltan, who lives in New York, for her image of a woman in hair rollers and latex gloves glancing "menacingly" at the artist while sharpening a large knife.

BBC: Wim Heldens wins 2011 BP Portrait Award