[scode type="green"]knuckle
n. (指人)指关节(指动物)膝关节, 踝[/scode]
音标：/'nʌk(ə)l/
英英释义：
Your knuckles are the rounded pieces of bone that form lumps on your hands where your fingers join your hands, and where your fingers bend.
例句：
①The girl tapped the door with her knuckles.
女孩用指关节轻轻敲门。
②Our fingers bend at the knuckle.
我们的手指在指关节处弯曲。
③Like you'd get your knuckles bloody for me.
而你为了我伤痕累累。----《exile》（Taylor Swift）
词语搭配：
**knuckle down
(尤指前期不努力之后）开始努力工作（或学习）**
If someone knuckles down, they begin to work or study very hard, especially after a period when they have done very little work.
例句：
①The only thing to do was knuckle down and get on with some serious hard work.
②He managed to knuckle down to his lessons long enough to pass his examination.
**knuckle under
屈服,让步,认输**
If you knuckle under, you do what someone else tells you to do or what a situation forces you to do, because you realize that you have no choice.
例句：
①It is arguable whether the rebels will knuckle under.
②The United States, he said, did not knuckle under to demands.
[scode type="green"]add insult to injury
雪上加霜，往伤口上撒盐[/scode]
英英释义：
To make an unfair or unacceptable situation even worse.
例句：
①They told me I was too old for the job, and then to add insult to injury, they refused to pay my expenses!
他们说我太老了，做不了这个工作。更让人受不了的是，他们还拒绝支付我的费用！
②Those eyes add insult to injury.
他人的关注只会雪上加霜。----《exile》（Taylor Swift）
