求大家帮我翻译一下下面一段文字，（不要在使用在线翻译，因为那是没有语法的）救急啊！！！

The paper mainly by using calculus knowledge, to solve some problems of the geometry. Here, we explores the derivative and derivative for area and volume first , and then we use the calculus and curvature, flexible rate and surface of the curve arc length of surface, the area of the domain relationship. Secondly, we will use to calculus differential geometry, the use of calculus to depict the surface of bending degree, the use of calculus to simplify curvilinear integral algorithm. Use the calculus handle more complex problem, often can first "into parts", put it divided into many smaller in time, space area of study, and then for the simple problems research. In fact this is the center of the calculus in thought.