three -order derivatives的用法和样例：
例句
- Aim In order to develop and improve the fixed point theorem in metric space and extend the application.
摘要目的为了进一步发展和完善度量空间中的不动点理论，扩展不动点定理的应用范围。 - This paper studies the existence of monotone positive solutions to a type of three point boundary value problems of nonlinear second-order differential equations.
摘要利用范数形式的锥上不动点定理，研究了一类二阶微分方程三点边值问题单调正解的存在性。
