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It is impossible to assign an exact date to this building.

确定这座建筑物的确切年代是不可能的。

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The complexity and perfection of the eye has meant that, to date, it's been all but impossible to reproduce its function artificially.

眼睛的完美和复杂性意味着，迄今为止，依然不可能利用人工的方法实现其完整的功能。

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John Sheriff, an investigator with the Royal Commission on the Ancient and Historic Monuments of Scotland, said it was impossible to date the stone precisely but it is very likely to be neolithic or Bronze Age, and could "easily" be 4, 000 years old.

BBC: Human remains found in Bronze Age pots

But the country's Nuclear Regulation Authority, which was created in response to the Fukushima disaster, has said meeting this date is "impossible" as new safety regulations won't be released until December.

WSJ: U.S. Opposes Japan's Nuclear Plan

When he talked to British Prime Minister Tony Blair after the decision on a date had been announced he denounced it as "impossible to accept".

BBC: Turks see silver lining in EU date