VOA慢速英语:Johannesburg Leads Africa in Twitter Usage

短语讲解：

1. The public relations company - Portland Communications carried out the study called "How Africa Tweets".

carry out 执行; 进行
例句：They should also carry out some fundamental reforms.
这些政府也应该执行一些基础性的改革。

2. Also, Egypt featured highly - Cairo, Alexandria, other top cities in terms of active tweeting.

in terms of 根据; 就…而言
例句：They also rated each in terms of perceived personality traits.
他们也根据人体特性的感知额定每个人。

3. In terms of topics, one of the shifts that we've seen is when we look at our survey in 2012 was that it was very much social conversations online.

look at 看; 评判
例句：Look at our verse today.
看我们今天的章节。

4. Africans love football, are very passionate about their football teams, and Twitter provides a platform again for fans to get behind their teams.

get behind 落在后面
例句：And investors had no shortage of activity to get behind during 2010.
而投资者在2010年投入了大量活动以防掉队。