So far, we have discussed a simple case where the action the response takes is dependent only on the content of the response message.
到目前为止，我们已经讨论了一种简单的情况，其中响应所采取的操作仅依赖于响应消息的内容。
It's very directional.It is highly dependent on what disturbed the water to begin with, the earthquake in this case.
海啸的方向性很强，它完全取决于最初的水体扰动是如何引起的，例如地震就有可能激起海啸。
Lazy loading is useful when the dependent components are not used for a business use case we are trying to achieve and solves the issue of unnecessarily loading components.
有时我们的业务并不会使用到依赖的那些组件，这时延迟加载就派上用场了，同时也无需加载那些用不上的组件了。
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