下一小节将描述一个运转良好的模型，在您构造测试层级的同时也伴随着避免常见缺陷的警报。

The sections that follow describe a model that works well, along with alerts about common pitfalls to avoid as you structure the test hierarchy.

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这部车不安全，因为构造上有缺陷。

The car was unsafe because of a defect in its construction.

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那售货员骗他说照相机真是价格低廉，但是他却没说那相机由于构造上的缺陷所以是停产型号。 他话里的threw somebody a curve 意思是耍花招骗人。

4：The salesman threw me a curve when he told me it was a real bargain, but he didn't say that the camera was a discontinued model because of its inbuilt defect.

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