像埃里卡这样的孩子能长这么大了却不知道灰是什么，直到她看到灰从山上喷涌而出。

A child like Erica could get this far without knowing what ash was, until she saw it spewing from a mountain.

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该飞机使用活塞式发动机，而不是身材庞大的喷气涡轮机，因此它不会像大型商业飞机那样受到火山灰的负面影响。

The plane uses a piston engine rather than a large-scale turbine jets, allowing it to travel unaffected through the ash, unlike large commercial jets.

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像中国、刚果、俄罗斯联邦和塔吉克斯坦所认识到的那样，脊灰病毒没有国界。

As China, Congo, the Russian Federation and Tajikistan have learned, the poliovirus does not respect national borders.

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