OAT功能被划分为一组模块，其中每个模块位于自己的PHP文件中。
OAT functionality is divided into a set of modules, with each module residing in its own PHP file.
模块是一组执行特定业务功能的自包含 (self-contained) 组件。
The module is a self-contained bundle of components that perform a specific business function.
haskell的标准库就是一组模块，每个模块都含有一组功能相近或相关的函数和类型。
The Haskell standard library is split into modules, each of them contains functions and types that are somehow related and serve some common purpose.
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