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We are talking about the Neolithic period here, which was the time before stone tools began to be replaced by tools made of bronze and other metals.

我们这里在说的是新石器时代，是石器开始被青铜和其他金属制工具所取代之前的那个时代。

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For the time before records began, we have only "proxy records" reconstructed largely from tree rings and ice cores, supplemented by a few incomplete written accounts.

在开始有记录之前，我们只有主要根据年轮和冰芯重建的“代理记录”，还有一些不完整的书面记录作为补充。

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There have been delays before. Officials said the average processing time in October of two thousand three was seventy-five days.

VOA: special.2009.06.11

If you go back to the time before that, we talked about this partnership game.

再往前回顾一下,我们之前还讲过合伙人的博弈

耶鲁公开课 - 博弈论课程节选

What was neat about it is before that time, the predominant species to use for air conditioning or refrigeration was ammonia.

在这之前是很整洁的，之前最主要的用于空调或者冰箱的,物质是氨。

麻省理工公开课 - 固态化学导论课程节选

The time before, he was caught by the Greeks and detained for several weeks.

ECONOMIST: A Bulgarian way into the EU

Companies can differentiate themselves on sustainability performance, but the time before an issue becomes generic is short.

FORBES: How the Sustainability Frontier Keeps Moving

And I am not just talking here about the time before there is a vacancy at Number Ten.

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