Rebellion - Rebellion has been one of the key themes of rock since the very beginning.

从一开始，叛逆就是摇滚乐非常重要的一个主题。

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A key attribute of the mainframe over the years has been its rock-solid security at the hardware and software level.

大型机多年来的一个关键特征是在硬件和软件级别具有可靠的安全性。

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Don had been an administrator in the Little Rock system a few years earlier, so he knew a lot of the players, and he had a friendly, low-key manner and got along well with most of them.

几年以前，他还在小石城做过行政管理工作。 对那里的各方面的人物都非常熟悉，他待人友好、举止低调，和多数人相处得很好。

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The announcer is likely to be played by US comedian Chris Rock - who has said Allen was one of his key influences.

BBC: News | Entertainment | Woody Allen to star in Spielberg film

The key challenge lies, of course in tapping into the juice, most of which is buried beneath layers of porous rock formations called shale.

FORBES: Chevron Digs Deeper Into Eastern Europe For Shale Gas