Each one is fairly simple on its own, but it's also important to see how they work together.
其中的每一个类或函数本身都十分简单，因此更重要的是要了解它们是如何协同工作的。
Its implementation is fairly simple and can be easily reused.
它的实现非常简单，并且很容易重用。
That's it. This is the model. Fairly simple in its design, and easy to remember.
这就是，这个模型，设计上相当简单，容易记忆。
That's it. This is the model. Fairly simple in its design, and easy to remember.
这就是，这个模型，设计上相当简单，容易记忆。
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