Making sure the brain's glucose levels do not drop could be the secret to staying slim, a study published in the Journal of Clinical Investigation suggested.

临床研究杂志的一项研究表明，维持大脑中的葡糖糖水平就是身段苗条的秘诀。

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The secret to the USB Doomsday Device is very simple - it has three levels of failsafe protection.

该设备的US B末日秘密很简单-它有三个保护级别的故障保护。

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One of the things we learn in this article, I think we probably knew it already, there are many levels of clearance, not just secret and you wrote in the piece that if you studied all the secret programs, the people who are cleared for secret, it was just too vast to even do it.

NPR: Intelligence Failures In 'Top Secret America'

But today, thanks to unprecedented levels of special-interest political money, and a flood of secret and unlimited cash, ordinary voters are being left on the sidelines.

FORBES: How Many Billionaires Does it Take to Buy a Nomination?

It is no secret that the Cali mob in its heyday bought support at the highest levels of society.

ECONOMIST: Colombia contemplates extraditing its drugsters