这是剧变的一段时期。

This is the period of revulsion.

youdao

有足够的理由可以表明2010年会是剧变的一年。

There are reasons to expect that 2010 could be a year of upheaval.

youdao

尽管树木年轮表明当时发生了气候剧变，却没有任何数据解释这次剧变的原因。

But while the tree rings show variability, there is no data for why these climate changes occurred.

youdao

And the crucial point about the case is that we stipulate that at no point was there a dramatic change.

这个案例的关键就在于,我们推断生命不可能会有戏剧化的剧变。

耶鲁公开课 - 死亡课程节选

The earth experiences he says certain periodic destructions and cataclysms civilizations are reduced to barbarism only to recover and grow again.

他说，世界不断经历,阶段性的摧残及剧变,文明虽被降格至野蛮,但终究会复原并再次茁壮。

耶鲁公开课 - 政治哲学导论课程节选