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。

youdao

A similar obstruction would set back the LHC schedule by weeks.

类似的障碍物会延迟LHC的计划数周。

youdao

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。

youdao

The president's meeting and conversation with Betty Currie on Sunday, January 18 is a central element in the allegation of obstruction set forth in Article II, and you will hear more about that from Cheryl Mills today.

CNN

The chancellor's call for political union is at its most incongruous when set against German obstruction of almost all ideas for resolving the euro crisis.

ECONOMIST: Charlemagne