视频对话：
He used to be in Special Forces.
他曾经参加特别军队。
Led a six-man team into Kosovo a couple years ago.
几年前带领了6人队去科索沃。
本期学习词汇：
force
n.力；武力；（社会）势力；魄力
例句：
1. It was hard for a police officer to make friends outside the force.
警官很难与警队外面的人交朋友。
2. The enemy are massing their force for an attack.
敌人正在集结部队准备反扑。
3. I don't hold with the use of force.
我不赞成使用武力。
4. We shall develop the progressive force.
我们应发展进步力量。
5. The electromagnetic force becomes dominant.
电磁力处于支配地位。