Its flat roof is broken only by the shallow dome of a planetarium beneath.

平屋顶里面是可以上下移动的天文馆圆顶。

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When its library moved to massive new premises 1.5 km away, it left behind one of the great English spaces: the 1857 Round Reading Room designed by Sydney Smirke, with its shallow dome, surrounded by an 8, 100 sq m internal court.

CNN: ASIANOW - TIME Asia

Scientists believe magma is now at a very shallow level and hot cracks in the dome are opening which is causing rockfalls on to the south crater floor.

BBC: Mount St Helens spews out steam and ash on 5 October 2004