刀口，拼音dāo kǒu，刀上用来切削的锋利的一边；像刀样锋利的窄棱或窄边；好的或恰当的地方；最需要的地方。
misc. knife edge ; cutter point ; tool edge
即使身处战场，他依旧仁慈聪慧，绝不在刀口留下心灵的污点。
His wit in the combat, as gentle as bright, Never carried a heart-stain away on its blade.
最近，我家的割草机吓了我一跳，我已经五年没有给它换油了—因为懒—所以刀口卡住了。
I recently had a scare with my lawnmower. I hadn't changed the oil on it once in five years -because I was lazy -and the blade seized up.
科学家们在汉诺威医学院对蝾螈进行了大量的实验，他们发现当它的一只腿被截断后，刀口处皮肤上的一层细胞会先开始成形。
Scientists experimenting on a batch of them in Hanover notice that after a limb has been amputated a layer of skin cells forms from the cells at the spot of the incision.
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