observers 观察者

recognise 正式承认、认可

gathered pace 加快了（发展）步伐

classification 分类，归类

digital edition 数字版，电子版

atlas 分布图集、图册

odd-shaped 奇形怪状的

contrails 飞机尾气凝结云

wispy 一缕缕的

halos （气象）光晕

snow devils “雪卷风”，一种自然现象

hailstones 冰雹

revolutionise 彻底改变、改革

fleeting 稍纵即逝的

formations （云的）形状

测验 请听报道并回答下列问题。

1. When were the first photographs of the asperitas clouds taken?

2. What has been a key development that has helped revolutionise the atlas?

3. True or false? Clouds formed by the vapours of aeroplanes have also been added to this global reference book.

4. Which word in the text could mean the opposite of 'professional'?

答案 1. When were the first photographs of the asperitas clouds taken?

Asperitas clouds were first photographed back in 2006.

2. What has been a key development that has helped revolutionise the atlas?

One key development that has helped revolutionise the atlas has been the smartphone.

3. True or false? Clouds formed by the vapours of aeroplanes have also been added to this global reference book.

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