At the final blowing stage, the relation between carbon content and decarbonization rate can be described by cubicfunction;
吹炼末期，碳含量和脱碳速率的关系可用三次方函数描述；
2
The relation of wind velocity and total amount of sand transport also changes with vegetation coverage: On shifting sandy land, wind velocity has a cubicfunction to the sand transport;
随着植被盖度的变化，风速与输沙率的关系也发生变化：流动沙地上风速与输沙率呈三次函数关系；
3
The method of using cubic spline function as fan characteristic curve fitting is introduced.