口子的英文：
opening; throat

参考例句：

Gash one's arm on a piece of broken glass
胳膊被玻璃碎片划了一个大口子.

Make a slit in the stem about half an inch long.
在树干上切一道大约半英寸长的口子。

On completion of the buttonhole the blade automatically cuts the center of the two rows of stitches.
锁完纽洞之后,刀片会自动地在两排针迹之间切开一道口子。

She has got a slight cut on the finger with a knife.
她的手指被刀切了一个轻微的口子。

The knife made a slash across his leg.
刀在他的腿上划出一道口子。

To make a hole or opening in;perforate.
穿孔于，打眼于在…里做一个洞或口子，打孔于

A slit is provided for the coin to drop through.
狭长的口子是供投硬币用的。

Have you sewn up the tear in my coat?
你把我大衣上那个撕破的口子缝起来了吗?

To make a long,deep cut in;slash deeply.
深切切一个既深又长的口子;深深地切

A framework of parallel or latticed bars for blocking an opening.
炉格栅；筛滤栅由平行或交叉的横木构成的框架，用于封住一个口子。

opening是什么意思：
n. 开，启，（职位的）空缺，（正式的）开始；开端；首场演出
adj. 开放的；开始的；首场演出的

They are open to temptations.
他们容易受诱惑。

The flowers are opening.
花正在开放。

an open package
未封上的包裹

It is easy to open a shop But hard to keep it always open
创业容易守业难

'Will you let me open it?' — 'Pardon?' — 'Can I open it?'
“我能打开它吗？”——“请再说一遍？”——“我能打开它吗？”

throat是什么意思：
n. 喉咙，嗓子；嗓音

throat armo(u)r
炉喉护板;护喉板

The tongue cuts the throat
祸从口出,言多必失

They slit his throat.
他们割开他的喉咙。

Her throat husked for crying.
椰子的外壳很明显非常坚固。

Mary has a bad cold and sore throat.
玛丽患了重感冒而且咽喉痛。