From my point of view, while it is true that the income gap may stimulate the social development to some extent, it causes trouble as well.
在我看来，虽然收入差距确实在一定程度上刺激了社会发展，但它也带来了很多问题。
The use of Observer in this way lets the controller be separated from the model, and the model be separated from the view, simplifying the development of GUI applications.
用这种方式使用观察者，可以让控制器与模型分离，让模型与视图分离，从而简化gui应用程序的开发。
Native app development may not be the hardest of tasks from a developer's point of view, but Web development is a skill they have likely already mastered and are adept at.
对开发者来说，本地应用开发可能并不是最困难的事情，但网络开发很有可能是他们已经熟练掌握的技术。
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