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.

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。

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As an antioxidant, lycopene protects cell structures and DNA against the nefarious effects of free radicals-small particles that damage healthy cells and allow tumor cells to develop.

作为抗氧化剂，番茄红素可以保护细胞结构和DNA远离自由基的影响——自由基是一种会破坏健康细胞、使癌细胞扩散的微粒。

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Especially the particles in ground layer of atmosphere damage human health strongly.

尤其是低层的大气颗粒物，对人体健康的影响重大。

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If it were not for this kick, the apparatus would be behaving just like Maxwell's Demon, a hypothetical creature (conceived of in the 19th century by James Clerk Maxwell) that could cause the spontaneous separation of hot and cold particles and thus do serious damage to some of the laws of physics.

ECONOMIST: Microrefrigeration

The flight bans came amid fears that the ash - a mixture of glass, sand and rock particles - can seriously damage aircraft engines.

BBC: EU emergency talks called on volcanic ash air chaos

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.

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