So though the total volume of the eruption, put at about 0.14 cubic kilometres, is low, the amount of ash capable of travelling long distances is high.

所以，尽管这次喷发的规模不大，大约0.14立方千米，但大量灰尘扩散到很远的地方。

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In total some 500, 000 square kilometres, roughly equivalent to the size of Spain, will be better protected in the three zones.

三个保护区内总计约500,000平方米的水域将被更好地保护起来，这一面积大概相当于西班牙国土面积的大小。

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It has a total catchment area of 17 square kilometres.

屯门河集水区的总面积为17平方公里。

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Most long-term predictions suggest that, despite weak growth over the past couple of years, the total of freight-tonne kilometres flown will expand by around 6% a year over the next couple of decades (see chart).

ECONOMIST: Inspecting the cargo | The

So though the total volume of the eruption, put at about 0.14 cubic kilometres, is low, the amount of ash capable of travelling long distances is high.

ECONOMIST: Volcanoes and air travel: Small eruption in Iceland | The