刀口的英文：
cut
incision

参考例句：

The nurse quickly sponged off the blood round the incision
护士迅速把刀口周围的血用海绵吸掉。

the edge of a knife
刀口

The cutting edge of the knife is first keened up.
刀口要先开刃。

He snapped the little lock with the blade of his stiletto.
他用短剑刀口迅速将锁撬开。

He turned the edge of the knife.
他使刀口卷刃[变钝]。

He bought a razor with a keen edge.
他买了一把刀口锋利的剃刀。

It is difficult to steel the razor.
把剃刀口钢化不太容易。

Why, George Babbitt, you're about as broad-minded and liberal as a razor-blade
嘿，乔治?巴比特，你像剃刀口那么宽宏大量，通情达理。

The flat-edged cutting part of a sharpened weapon or tool
刀刃削磨用的武器或工具的刀口处用来切割的部分

"I took out my knife, opened it, wiped off the blade and pared off the dirty outside surface of the cheese."
我拿出小刀,打开来,揩揩刀口,刮掉干酪肮脏的表皮。

cut是什么意思：
v. 切，割；裁剪；削减；缩短；剪切；删剪；停止；不出席；刺痛；切牌；相交
n. 切口；伤口；削减；式样；剪裁；切片；削球

That was a cut at me.
那是中伤我的话。

Gasoline cuts oil and grease.
汽油溶解油脂。

She cut a hole in the cloth.
她在布上剪了个洞。

The article is too long, it has to be cut.
这篇文章太长了，要删减。

The alloy cuts tough.
这种合金切起来比较韧。

incision是什么意思：
n. 切成开口,切割,雕刻,切入

The new plastic incise drape could reduce incision and inner incision contamination.
新型切口保护膜能有效地减少切口及切口内部的污染。

The muscle and fascial layers are incised lateral to a rectus incision
在腹直肌切口外侧切开肌肉和筋膜层。

this was as painful and as poignant as an incision in the living flesh
那样想是和椎心刺骨一样苦楚创痛的

The statute is hardly a masterpiece of insightful policymaking or incisive drafting.
这个法案几乎不算一个有见识的杰作，也算不上是个透彻的草案。

This is a long, narrow surgical knife for minor incisions.
这是外科手术刀用于细微切割的一种外科用细长刀。