中国历史博物馆主要呈现了三个重要时期的中国历史。

The Museum of Chinese history displays three critical periods of Chinese history.

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中国历史博物馆主要呈现了三个重要时期的中国历史。

The Museum of ChineseHistory displays three critical periods of Chinese history.

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关于在这一亿年的重要时期中没有化石，有一种解释是，早期的动物是软体动物，根本不会变成化石。

One interpretation regarding the absence of fossils during this important 100-million-year period is that early animals were soft-bodied and simply did not fossilize.

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By the way, some of it were not pleasant; the cultural wars I found very unpleasant, although it may have been the most important kinds of thing I did.

顺便说一下，这个经历并不是一直很愉快;,我自己不怎么喜欢文化论战，虽然,我最重要的工作很可能是在那个时期。

普林斯顿公开课 - 人性课程节选

That's not really all that important for us because what's important for us is to see at this point, either 200 or 400,what was included and what was not.

这对我们并不怎么重要,因为重要的是在那个时期，即主后两百年或四百年，书目上有哪些书。

耶鲁公开课 - 新约课程节选

I think we're in a very interesting time for banking and for the economy as a whole.

我认为现在正处于银行业和经济,发展中很重要的一个时期

耶鲁公开课 - 金融市场课程节选