BBC在线收听下载:2016年巴西里约奥运会闭幕

短语讲解：

1. Police in Brazil have carried out new raids of premises linked to the Olympic Council of Ireland over allegations about illegal sale tickets.

carry out 进行; 执行; 完成
例句：No matter what we do, we must carry out our duties.
无论干什么工作,我们都应履行自己的职责。

2. A dual suicide bomb attack by the Somali Islamist group al-Shabab has killed at least 15 people in central city of Galkayo.

at least 至少
例句：In fact it requires at least n generators.
事实上，它至少要有n个元素。

3. Roman Roslovtsev crossed to Ukraine from Belarus early in the day, he told local television he was seeking asylum because of persecution by the Russian security service.

because of 因为，由于
例句：The journey was slow because of continual stops.
由于常常停下来，所以行程很慢。