词汇讲解：
1. tornadoe n. 龙卷风例句：A tornado whirled into the town last week.
龙卷风上周袭击了这座城市。
2. observe v. 观察，研究例句：It will observe Jupiter and its moons for two years.
它将对木星及其卫星进行为期两年的观测。
3. sighting n. 观察，瞄准，视线，看见例句：The ancient Egyptians used levels and calibrated rods for sighting over long distances .
古埃及人使用水平仪与量尺做长距观测。
4. rip v. 扯破，撕坏例句：He ripped the letter and read it.
他撕开信便读起来。
5. life-or-death adj. 生死攸关的例句：In this life-or-death climax, he showed himself a terrible personality.
在这个生死关头，他表现出一种令人惧怕的性格。
6. outbreak n. 爆发，突然发生 例句：At the outbreak of the war he lived in London.
战争爆发时他住在伦敦。
7. humidity n. 湿度，湿气例句：The relative humidity is over 85%.
相对湿度在85%以上。
8. northeasterly adj. 向东北的，来自东北的例句：The current had a northeasterly set.
水朝东北方流去。
9. severity n. 严重，剧烈例句：The disease ranges widely in severity.
这种病的严重程度可以很不同。
10. rate vt. 定级例句：They rated the new film.
他们给那部新片定了级。
11. footage n. 电影片段，镜头例句：The film contained some old newsreel footage.
这部影片中有些旧
新闻片的镜头。
12. participant n. 参与者，参加者例句：She is an active participant in this activity.
她积极参与这项活动。
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