CNN news 2011-04-08 加文本

短语讲解：

1. It opened up over passengers' heads on a flight from Phoenix, Arizona to Sacramento, California.

open up 打开
例句：It suddenly occurred to one of the workers to open up the box. 
一个工人突然想起打开箱子看个究竟。

2. The pilots made an emergency landing in Yuma, Arizona, and no one was seriously injured.

make an emergency landing 做紧急降落
例句：The best bet for the pilot was to make an emergency landing. 
驾驶员应采取的上策是紧急降落。

3. Southwest grounded 79 of its planes to check them out afterward.

check out结帐后离开，办妥手续离去
例句：He plans to check out on Tuesday. 
他打算在星期二结账离开旅馆。

4. Southwest found indications of cracks in three other aircraft while dozens of others have been inspected and returned to the flight line.

dozens of 许多
例句：The tornado claimed dozens of lives. 
那场龙卷风夺去了几十条人命。

5. It's not known exactly what caused the crash of an Air France jet two years ago, though. Flight 447 was traveling from Paris to Rio de Janiero, Brazil, when it went down in the southern Atlantic Ocean.

go down 沉下，落下
例句：The plane went down in flames.
飞机着火坠落。