BBC在线收听下载:Uber将推出无人驾驶汽车

1. challenge n. 挑战; 质疑; 盘问
例句：I challenge the truth of your story.
我对你所说的是否真实持怀疑态度。

2. deliver vt.交付; 发表; 递送
例句：A postman is a man employed to deliver letters and parcels.
邮差就是雇用来投递信件和包裹的人。

3. invent vt.虚构; 发明，创造
例句：People who could invent a new human being were people not to be crossed.
那帮能够制造出具有假身份证的新人的家伙不好惹。

4. contribute vt.贡献出; 捐赠（款项）
例句：A number of factors contribute to this.
对于此总可以归诸于许多因素。

5. responsibility n.责任; 职责; 负责任
例句：Are you willing to accept responsibility?
你愿意承担责任吗?

6. announce vt.宣布; 述说; 声称
例句：Please announce to the children that there will be no school this afternoon.
请通知孩子们今天下午不上课。

7. confirm vt.证实; [法] 确认，批准
例句: X-rays have confirmed that he has not broken any bones
X光片证实他没有骨折。

8. terrorism n.恐怖主义，恐怖手段; 威吓
例句：What separates terrorism from other acts of violence?
恐怖主义和其他暴力行为的区别是什么？