Its system consists of two silos filled with a pulverised rock such as gravel.

该系统由两个筒仓构成，每个筒仓装满磨碎的岩石，例如砂砾。

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From their take on music to a rock solid operating system, every product design choice Apple makes is governed by simplicity, ease of use and functionality.

从收入音乐到坚如磐石的操作系统，苹果公司对每个产品设计的选择都基于简单，易用和功能这三个标准。

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But that option is steadfastly opposed by the European Central bank, which fears it might rock a euro-area banking system that is still far from healthy.

但此选项被欧洲央行坚决反对，其担心这会动摇现今任脆弱的欧元区银行体系。

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For those looking for a more traditional live music venue, The Roxy Live (open all week, from 8 pm on weeknights and 9 pm on weekends) is a fully fledged rock club, with a professional sound system, a 500-person capacity and a stage that towers over the audience.

BBC: Rock around the clock in Buenos Aires

And a rock-solid banking system is one reason why Hong Kong, with the most open financial markets in East Asia, has so far weathered the storm better than many of its neighbours.

ECONOMIST: Keeping the hot money out

Fred returned to the U.S. on the eve of World War II and built an even larger fortune around Rock Island Refining, a refinery and oil-gathering pipeline system in southern Oklahoma, and a part-interest in a refinery outside of Minneapolis.

FORBES: Inside The Koch Empire: How The Brothers Plan To Reshape America