例句：
Bread knives should have a serrated edge.
面包刀的'刀刃应带有波浪齿。
Two knife racks hold her favourite knives.
两个刀架上放着她最喜爱的刀。
2 000 knives have been handed in during the month-long amnesty.
在一个月的赦免期中交出了2 000把刀。
