Hard to calculate all teachers and students love everlasting, addition, subtraction, multiplication, and division, the body of point, line and plane is finished package? Happy teachers' day!
师生情天长地久，加减乘除难算尽，点线面体又岂包完？祝教师节快乐！
2
By introducing the subtraction clustering algorithm, the sample data are classified and the local model parameters are identified off-line using the corresponding data set.
引入减法聚类算法对样本数据进行分类，用得到的分类数据对局部模型参数进行离线辨识。
3
The line shapes used in XPS and their combination were introduced in detail. The background subtraction methods and their effects on analysis results were discussed.