knives的单数是: knife
You are welcome to the loan of my knife .你可随意借用我的小刀。
She told him the knives weren't sharp .她告诉他，这些刀都太钝。
The knife fell from her nerveless fingers .刀子从她那无力的手指中落下。
With a nasty grin on his face he took out a knife .他狞笑着掏出了刀子。
The butcher's knife cut cleanly through the meat .屠夫的刀利落地切着肉。
The knives and forks set up their regular jingle .刀叉发出常有的叮当声。
The mugger thrust at his victim with a knife .抢劫者用刀子向受害人刺去。
