迷你对话：
A: What is wrong with your face?
你的脸怎么啦?
B: My brother did it.
我哥打的。
A: Why?
他为什么打你?
B: I laughed up my sleeves at him. He’s seen his girlfriend off at the airport and had lipstick on his face and did not know it.
我偷偷地笑他来着。他到机场送女朋友，脸上留有口红印，他还不知道。
地道表达：
laugh up one’s sleeve
解词释义：
这是一个习语，也可以说为laugh in one’s sleeves，字面意思是“用袖子挡着脸笑”，也就是“偷偷笑”“窃笑”的意思。
支持范例：
He was laughing in his sleeve when Joe answered the phone because he knew the call would be a joke.
乔在接电话时，他心里暗暗发笑，因为他知道这个电话是玩笑。
Brockway watched me out of the corner of his eye, laughing up my sleeves noiselessly.
布罗克韦斜着眼睛看我，无声地窃笑着。
He could sense that his former colleagues were laughing in their sleeves over his dismissal.
他可以感觉到过去的同事都在窃笑他被撤职。
She could not understand at first why they were laughing up their sleeves.
她起初弄不明白为什么他们用手捂着嘴暗暗窃笑。
