A motorized knife sharpener will give you an adequate edge, but true purists like to do this chore by hand.

电动磨刀器会给你足够的优势， 但真正的纯粹主义者喜欢手工完成这项工作。

" But they've used you as a knife sharpener, " said Ron, winding slightly as they passed a lamp and Neville's injuries were thrown into even greater relief.

“可他们这是在拿你磨刀呀。”罗恩说。他们从一盏灯下走过时，灯光照得纳威的伤口更加触目惊心，罗恩看了不禁一哆嗦。