They had undoubtedly made progress in the six years that separated the two periods.

他们无疑在那两个时期之间的6年里取得了进步。

《柯林斯英汉双解大词典》

However, we have already reached temperatures that are in line with other minimum-ice periods, so continued warming is likely not natural.

然而，我们已经达到了与其他最低冰期相一致的温度，所以持续变暖可能是不正常的。

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The symbolism may come from the fact that the olive tree takes a long time to produce fruit, so olives could only be cultivated successfully in long periods of peace.

它的象征意义可能来自于橄榄树需要很长时间才能结出果实，所以橄榄只能在长久的和平时期才能被成功种植。

youdao

Other scientists have shown that sun spot activity can be measured in periods of time that last about eleven years.

VOA: special.2009.09.29

They thrust together different texts, different languages, writing from different historical periods, all there, compressed in that remarkable mad song that concludes the poem.

它们将不同文字，不同语言，不同历史时代的书写，相互交织穿插，都呈现在那里，摘要叙述在一首举世闻名却又疯狂的结尾歌里。

耶鲁公开课 - 现代诗歌课程节选

And then in the intervening periods, they are on distant learning modules that the students complete.

其余时间，学生通过远程学习模式完成。

哈佛公开课 - 幸福课课程节选

What is obvious in Britain is that during periods of peak demand, the stock in many regions, including central London, is insufficient.

ECONOMIST: The health service

The Rangers said in between periods that Powe's return was questionable, but he didn't get back onto the ice.

WSJ: Rangers D Staal returns from serious eye injury

The Rangers said in between periods that Powe's return was questionable.

WSJ: Rangers D Staal returns from serious eye injury