modulus principle的用法和样例：
例句
- Maximum modulus principle plays an important role in the complex analytics, and it is a powerful tool in studying the analytic function.
摘要最大模原理在复变函数论中占有重要的地位，是研究解析函数的有力工具。 - This paper discusses the object-orientated modeling principle of die casting database and gives a realization and visualization method for the database system.
采用面向对象的方法，论述了压铸工艺数据库的建模原理，给出了数据库的实现及其可视化方法。
