For example, the glass "light roof" in Germany can control the color, light, and temperature of an entire building.

例如，德国的玻璃“光顶”就可控制整栋建筑的色调、亮度和温度。

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Now,theoretically, only the speakers and deputy speakers of the two houses of parliament may use the lights officially, but there are still dozens of cars on the Moscow roads that continue to exploit the advantages of a blue light on the roof.

VOA: standard.2010.05.19

Structured like a tree, the new centre will have a huge canopy letting in light through the roof.

BBC: NEWS | UK | England | Cornwall | Eden's ?12m education plans

Some business leaders, state officials and MPs are allowed to drive with a blue light on the roof, giving them the right to cut through traffic.

BBC: Russian President Vladimir Putin to cut motorcades

Many Russians, despite the financial chaos, are rich enough to pay a few thousand dollars for an officially sanctioned flashing blue light on their car roof, allowing them to carve through the traffic like a marauding Cossack.

ECONOMIST: Watch me flash