CNN news 2011-04-19 加文本

短语讲解：

1. It was the kind of forecast we don't like to hear: Predictions of tornadoes as cold air combined with warm air in a storm system sweeping across the southeast.

combine with 与…结合
例句：If he can combine his ability with hard work, he should be very successful.
如果他能把自己的才能和勤奋结合起来, 必定会很有成就。

2. Of the 100+ tornadoes seen during this storm, we don't know yet how many of them touched down in North Carolina.

touch down 着陆，降落，登陆
例句：In central Kansas, a tornado touched down.
龙卷风在堪萨斯州中部地区登陆。

3. TJ Holmes from cnn Sunday Morning gives you a glimpse of the kind of damage these storms left behind.

leave behind 留下
例句：I'll leave my bicycle behind. I’ll not need it for the time being.
我要把自行车留下来，我暂时不需要它。

4. In nearby Birmingham, heavy winds knocked down power lines and tore off roofs.

knock down 击倒，撞倒
例句：I carelessly knocked the chair down.
我不小心将椅子撞倒了。
tear off 掀掉，脱掉，扯掉
例句：The cover of the dictionary has been torn off.
词典的封面已经被撕掉了。

5. In Mississippi, folks are waking up to a state of emergency in 14 counties.

wake up to 意识到
例句：I wish I could wake her up to the danger she is in.
我希望能唤醒她认识到处境的危险。

6. Then, all of a sudden, we've seen like a black funnel cloud.

all of a sudden 突然
例句：He was writing his essay when, all of a sudden, he was seized with giddiness.
他正在写论文, 突然一阵头晕。

7. In the Atlanta area, a tornado watch was in effect for most of the night.

in effect 在实施中，有效
例句：Initially the contract will be in effect for 3 years. 
最初契约的有效期为三年。 

8. When this woman came to check on her parents after large tree uprooted and fell through their roof.

check on 检查，核对
例句：You should go to have the doctor check on your health.
你应当去找医生检查一下身体的健康状况。
fall through 跌落，落下
例句：The boy fell through the ice and was drowned.
这个男孩子掉入冰窟中淹死了。