例句：The professor took off for Shanghai this morning.
教授今天上午动身去上海了。

2.suicide bomber 人体炸弹

例句：Rajiv Gandhi is believed to have been killed by a suicide bomber.
拉吉夫甘地据信是被一名自杀性袭击者炸死的。

3.security guard 安保人员

例句：We have a security guard around the whole area.
我们在该地区各处部署了保安。

4.city center 市中心

例句：Revelers pay as much as 6 pounds in a city center nightclub.
而狂欢者在城市中心的夜总会要支付6英镑。