BBC在线收听下载:白宫称奥巴马将访问尼日利亚

短语讲解：

1. However, according to the prosecutor's office, these later medical records showed know him has been suicidal or aggressive against other people.

according to 根据，按照
例句：Answer a fool according to his folly. 
按愚人的蠢话回答愚人。 

2. Aid workers in Yemen say an airstrike at a refugee camp in the north of the country has killed at least 45 people.

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. We do not believe an organization like the Houthis is capable of mugging such a military campaign without direct outside force.

be capable of 能够
例句：Susan is capable of hard work. 
苏珊能胜任艰苦的工作。 

4. Britain is seeing its first day of formal political campaigning for the upcoming general election with the leaders of all main parties setting out their stalls.

set out 动身;  出发; 着手; 安排
例句：He set out to conquer the literary world of London. 
他决心赢得伦敦文学界的赞誉. 

5. After his 10-minute audience with the Queen, David Cameron said the country faced a stark choice at the general election if Ed Miliband ended up as prime minister, he said it would lead to economic chaos.

lead to 导致
例句：That may lead to a serious split in our class. 
那可能导致我们班的严重分裂。

6. Britain and United States have expressed concern about rigging in the counting of votes after Nigeria's general election.

concern about 使（自己）关心…
例句：She showed great concern about you. 
她很为你担心。