冰岛一座冰川火山喷发的浓厚烟尘迫使欧洲北部大部分国家关闭机场、延迟并取消航班。

A huge cloud of volcanic ash from Iceland has forced authorities to shut down air travel across much of northern Europe, with delays and cancelations spreading quickly.

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尽管60%的投票人都投了赞成票，保留机场，但是至少有四分之一的登记投票人不得不同意关闭机场。

Though 60% of those who voted said yes, at least a quarter of eligible voters had to give their approval.

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但是，在决定关闭机场时并未考虑何为危险、隐性伤害和安全间的界限以及这三种级别如何随火山灰微粒类型与数量的变化而改变的因素。

But where the boundaries between danger, potential damage and safety lie, and how they vary with the type and number of ash particles, was not taken into account in the decisions to close airspace.

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