首先，在模型浏览器中创建一个类。

First, create a class in the model explorer.

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在模型中，联系用一条直线表示。

In a model, an association is drawn as a line.

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在模型引用迭代处您要更改部件。

You change the part where the iteration on the model references is taking place.

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Well, this view, this evolutionary view, or evolutionary model, was challenged by man a named Yehezkel Kaufmann in the 1930's.

这个改进了的观点，或者说改进了的模型，在20世纪30年代受到了来自考夫曼的质疑。

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And there are a lot of questions that people are asking in using the Star Festival as a model.

人们在用“七夕“这一模型的时候,问着许多的问题。

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And, a lot of the derivations you will see in physics rely on this being able to model as point charges.

然后，你在物理学中看到的许多东西,都是靠以点电荷为模型得到的。

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