Countless episodes like that linger over eastern Europe like an invisible toxic cloud.

无数类似的事件犹如一团不可望见的毒雾在东欧的上空徘徊不散。

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"When the toxic cloud falls down, it ACTS like acid rain, damaging plants and monuments," Ribeiro added.

“当毒云落下，它就像酸雨一样，破坏着植物和古迹，”里贝罗补充说。

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At its altitude of 2, 250m the air is already thin; on days when the toxic "cream", as the familiar brown cloud of pollution is locally known, descends on the city, it is hard to breathe.

在海拔2250的高空，空气十分的稀薄；白天，人们熟知的棕色“毒气”沉降到城市里，令人窒息。

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Across the country trains had derailed, including one carrying industrial chemicals that exploded into a toxic cloud.

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