为了使现象更容易观察，图片没有显示曲线从40到120的部分，放大了曲线从30到40的部分
In order to make the phenomenon easy to observe, the curve between 40 and 120 is not displayed on the picture, but the curve between 30 and 40 is enlarged.
为了使现象更容易观察，图片没有显示曲线从40到120的部分，放大了曲线从30到40的部分
in order to observe the phenomena clearly, the curve between 30 and 40 is enlarged, while the part from 40 to 120 is dismissed.
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