BBC在线收听下载:奥巴马宣布将投资非洲数十亿美元

短语讲解：

1. The BBC diplomatic correspondent Jonathan Marcus says its part of a step-by-step process.

step-by-step 按部就班的；按步；步进
例句：We have proposed a step-by-step transition to socialism.This is a better formulation. 
我们提出逐步过渡到社会主义，这比较好。 

2. The first thing is whether this 72-hour truce actually survives, then whether the negotiations that are underway through Egyptian mediation are actually able to bring about something that resembles a lasting ceasefire, then of course can something be done to mean, to make sure that this is the last episode of this kind or are Israel and the Palestinians of Gaza Strip fated to repeat this experience every two or three years.

be able to 能够
例句：Mould you be able to describe a typical day on the job? 
您能描述一下这个职位的日常工作内容吗？ 
make sure 确保
例句：Screen her bed and make sure she is not disturbed. 
把她的床隔开,确保她不受干扰。 

3. The media conglomerate 21st Century Fox which is owned by the tycoon Rupert Murdoch has withdrawn its bid to take over the American entertainment company Time Warner.

take over 带；接管；帮…学习
例句：A younger generation will begin to take over.
年轻一代将会开始接管中国的事务。

4. And as of today, including an additional $12 billion in new commitments being announced this week by our private sector partners and the World Bank and the government of Sweden, we've now mobilized a total of more than $26 billion to Power Africa just since we announced it, $26 billion.

a total of 总数为
例句：The book has three parts with a total of fifteen chapters.
本书共分三个部分，十五个章节。
more than 多于
例句：Margaret needed support more than ever. 
玛格丽特比以往更需要关心。 

5. They called for international pressure to encourage the rebels to return to the talks.

call for 需要；要求
例句：Different circumstances call for different tactics. 
不同的情势需要不同的策略。