[R] how to rotate the x axis lable to an interested angle?

[komais]

http://r.789695.n4.nabble.com/file/n2718591/QQ%E6%88%AA%E5%9B%BE%E6%9C%AA%E5%91%BD%E5%90%8D--1.png 

I am  a beginner for R,and i could not solve this problem.who can help me to
solve it ?
how to rotate the x axis lable to an interested angle as the picture show? 
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