During decades there have been many people who have had sightings of strange lights in the sky.

几十年来，已经有许多人在天空中目击到奇怪的光点。

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Without question, manufacturing has taken a significant hit during recent decades, and further trade deals raise questions about whether new shocks could hit manufacturing.

毫无疑问，近几十年来，制造业遭受了重大打击，而进一步的贸易协议引发了一些关于新的冲击是否会影响制造业的问题。

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Research during the past several decades on the nature of language and the processes that produce and make it understandable has revealed great complexity instead of underlying simplicity.

在过去的几十年中，对语言的本质以及产生并使其易于理解的过程的研究表明，它具有极大的复杂性，而不是潜在的简单性。

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ETA is blamed for the deaths of more than 800 people during the past four decades, with most of the assassinations taking place in Spain.

VOA: standard.2010.05.20

His report says human rights abuses occurred for decades in Zimbabwe but that they worsened after the year 2000 and peaked during the disputed elections last year.

VOA: standard.2009.06.21

The one constant during decades of caffeinated talk was the question of how far Egypt would embrace Western norms.

ECONOMIST: The caf�� at the heart of revolutionary Cairo

During decades of guerilla war between Iraqi Kurds and the government in Baghdad, Tehran accepted hundreds of thousands of Iraqi Kurdish refugees.

NPR: Kurdistan Caught in Middle of Iran-U.S. Tensions

During decades of trial and error, the Stanford University scientists overcame engineering glitches, launch delays, budget fights, solar flares, faulty data and seven federal investigations.

WSJ: Researchers Spent $750 million��and 52 Years��Affirming Theory of Relativity