这些沉积物的形成环境现在还没有被完全弄清楚，科学家们不确定它们之间是否有差异。

Also, because the environment during which the deposits formed is not well understood, scientists are not sure how diverse they will be.

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一家州立出版物解释到，“快速上手”项目“移除了劳动力质量的不确定性”：它帮助企业克服了南方的缺陷。

One state publication explains that FastStart “has removed uncertainty about workforce quality”: that is, it has helped companies get over their hang-ups about the South.

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当然，这些污染物对气候变暖造成的确切影响，在科学上仍存在一定程度的不确定性。

Of course, a degree of scientific uncertainty remains about some of these pollutants' precise contribution to warming.

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One of the labors of reading Paradise Lost is the reader's obligation to supply the analog for the X, and this poem is filled with such X's.

读的一个麻烦就是,读者需要自行类比出X究竟是什么，偏偏诗中又充满了这种不确定物。

耶鲁公开课 - 弥尔顿课程节选