[句型解析]
“no wonder...”意思是“难怪；不足为怪”，当我们弄清楚了某件事的原由，便不会对此感到奇怪，经常会来一句“难怪……”，后加“that”从句，“that”也可省略。“Small wonder...”“Little wonder...”表达的也是相似的意思。

[实例]
1. You eat so little. No wonder you are so slim.
你吃得这么少，难怪这么瘦。
2. Are you a librarian? No wonder you are so well read.
你是图书管理员？难怪这么博学。
3. There is something wrong with your leg? No wonder you walk so slowly.
你的腿出问题了？难怪你走得这么慢。

keep your hair on 你冷静一下

“冷静”的表达：

keep one's shirt/wig/hair on
Keep your shirt on. He didn't mean to offend you. That's just the way he talks.
冷静一下，他不是有意冒犯你的，他一直都是这样的说话方式. ( ╮(╯▽╰)╭ 有的人确实就是这样滴...林子大了...咳咳...)

接下去的两个就是 Keep your wig on! / Keep your hair on! 一样的架构. 直接这样用就行了，造句的话：
I hope you'll keep your hair on with me for the things I am gonna talk. 接下去我要说的内容希望你能够冷静不要对我发火。

keep up with 后面一般接名词
1. 跟上
They walked so fast that I could not keep up with them.
他们走得那么快,我没法跟上。
2. 和...保持联系
She has kept up with some of her friends since her retirement.
她退休后一直同一些朋友保持着联系。