与其他任何PHP V5对象相似，SDO也拥有一组属性，但与普通PHP V5对象的不同之处在于，SDO只是数据值容器，不能有为之定义的应用方法。
Like any PHP V5 object, an SDO has a set of properties, but unlike a normal PHP V5 object they are just containers for data values and cannot have application methods defined for them.
依赖性解析——轻量级容器提供了一个普通的依赖性解析策略。
Dependency resolution — Lightweight containers provide a common dependency-resolution strategy.
容器。一般都是一些普通的数据结构，如vector, set, list, map。
Containers, where common data structures are defined, such as vector, set, list, map etc.
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