external function reference

例句：

1. 1.The external function reference in the code is crucial for the system's stability.
   代码中的外部函数引用对系统的稳定性至关重要。
2. 2.The external function reference was designed to simplify the integration process.
   外部函数引用的设计旨在简化集成过程。
3. 3.The external function reference allows developers to easily manage and update the system's functionality.
   外部函数引用允许开发人员轻松管理和更新系统的功能性。