The preparation methods of two kinds of sliding blocks made from ultra high molecular weight polyethylene(UHMWPE) composite and pure polytetrafluorethylene(PTFE) powder were introduced respectively.

介绍超高分子量聚乙烯（UHMWPE）和聚四氟乙烯（PTFE）两款桥梁支座滑块的制备方法，并对滑块的性能进行了研究。

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Geologists believe that the petroliferous structures discovered in the deep blocks extend westwards into contiguous ultra-deep blocks.

ECONOMIST: Angolan oil: Drilling down | The

It was such successes that fuelled the frenzied bidding last year, when the first three ultra-deep blocks (numbers 31, 32 and 33) became available.

ECONOMIST: Angolan oil: Drilling down | The

China's capital may be racing towards the future at breakneck speed but sneak behind one of the city's glittering, ultra-modern tower blocks and you find a slice of old Beijing that seems to have been lost in time.

BBC: Old Beijing at its timeless best