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重点讲解：
1. touch down 降落；着陆；
Spacecraft Columbia touched down yesterday.
“哥伦比亚”号宇宙飞船昨天着陆。
2. burn up 烧毁；烧光；
The satellite re-entered the atmosphere and burned up.
卫星重新进入大气层，烧成灰烬。
3. in public 公开地；当众；
Most people have a horror of speaking in public.
大多数人都十分害怕当众讲话。
4. separate from 使……分离；
South America separated from Africa 200 million years ago.
2亿年前南美洲和非洲分离。
