恒星生命周期的模式，大部分取决于它们的初始质量。
The life cycles of stars follow patterns based mostly on their initial mass.
实现可以声明生命周期方法，以供初始化组件实例或范围过期时调用。
An implementation can declare lifecycle methods that are called when a component instance is instantiated or when the scope is expired.
这5个模型不仅可以被用在初始设计，对贯穿整个系统生命周期的需求变更亦有裨益。
These five models can be used not only for initial design, but also when requirements change throughout the system lifecycle.
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