We've been searching for dark matter for decades now, but we still have no idea what it might be.

几十年来至今，我们一直在搜寻暗物质，但是，还是不知道它有可能是什么。

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For decades there were just those two types of investors, but now a third type has appeared halfway between them: the so-called super-angels.

在数十年里，只有这两类投资者，但是现在出现了介于这两者之间的第三类投资者：所谓的超级天使。

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Having agitated about global warming for decades, northerners now find the focus is not on them but on wildlife.

数十年来对全球气候变暖焦虑不安的北方人现在发现焦点问题不是他们自己，而是野生动物。

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But for decades now, Americans have watched that compact erode.

FORBES: Full Text: President Obama's Address To Congress On His Jobs Plan

Some of Marriott's competitors, such as Sheraton and Hilton, have had light presences in sub-Saharan Africa for decades but now are stepping up growth.

WSJ: Hoteliers Race to Expand in Africa

It has been the standard approach for decades but now a High Court judge has interpreted the legislation as saying that once four days have passed, including the period on bail, detectives must have new evidence (key phrase) before they can force Suspect Sam back to the station.

BBC: Police bail in the dock