In the last chapter, we introduce the concept of obstruction set for diffeomorphism and obtain some results on normal sets. We do not prove these results directly.

在第三章我们对离散系统引入了阻碍集的概念，并探讨了在此情形下的正常集的一些理论。

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Thus, they see the sun rise later and set earlier than it does for a horizon without obstruction, she said.

因此，相较于毫无遮挡的情况来说，他们看到太阳升起的会晚一些，而落下的会早一些，她说。

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Thus, they see the sun rise later and set earlier than it does for a horizon without obstruction, she said.

因此，相较于毫无遮挡的情况来说，他们看到太阳升起的会晚一些，而落下的会早一些，她说。

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