刀口法是测量光学系统的传递函数一种基本方法，通过对刀口边缘误差建立数学模型，讨论刀口误差对光学传递函数测量精度的影响。
Using a knife edge to measure the MTF of optical system is a basic way. The paper discusses the influence of slit edge error on MTF by building a mathematical model.
对刀口边缘误差进行了定量分析，得出在一定精度范围内测量光强的区域，定性分析了使用拟合法求MTF优于使用均值法求MTF。
The quantitative analysis result shows that it can reach the given precision by only measuring limited area. It also shows that fitting-curve-method is better than averaging method for precision.
科学家们在汉诺威医学院对蝾螈进行了大量的实验，他们发现当它的一只腿被截断后，刀口处皮肤上的一层细胞会先开始成形。
Scientists experimenting on a batch of them in Hanover notice that after a limb has been amputated a layer of skin cells forms from the cells at the spot of the incision.
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