例句：

　　Bread knives should have a serrated edge.

　　面包刀的刀刃應(yīng)帶有波浪齒。

　　Two knife racks hold her favourite knives.

　　兩個(gè)刀架上放著她最喜愛(ài)的刀。

　　2 000 knives have been handed in during the month-long amnesty.

　　在一個(gè)月的赦免期中交出了2 000把刀。