BBC在线收听下载:美国得州摩托车黑帮发生枪战

短语讲解：

1. I will tell you that in 34 years of law enforcement, this is the most violent crime scene that I have ever been involved in.

involve in 使参与[陷入，牵扯到]
例句：Mary do not want to get involve in any perplexed relationship with a marroed man.
玛俐不愿扯入与已婚男人纠缠不清的关系中。

2. Two police officers and at least two Palestinians are reported to have been wounded.

at least 至少
例句：At least, I sincerely hope so.
至少我是真诚地这样希望的。

3. The data released today at the American Thoracic Society demonstrate that ivacaftor and the second drug called lumacaftor have a very positive effect on the most common mutation in cystic fibrosis.

have a effect on 有影响
例句：It is likely to have a soothing effect on him.
这样很可能对他产生一种镇定的效用。

4. They accuse Mr. Gruevski and members of his government of corruption. He’s refused to stand down and will hold a rally on Monday.
 
stand down 放弃席位;解除戒备状态，恢复正常执勤
例句：She of feted to stand down in favor of her husband.
她愿意退出竞选支持她丈夫。