BBC在线收听下载:奥巴马呼吁对美国最富人群增税

短语讲解：

1. But people are still buried under rubble, and the number of dead is expected to rise.

be expected to 被期待做某事;有望做某事;期许
例句：That could hardly be expected to last.
这很难预计将持续多久。

2. So it would only mean that we need to step up our efforts.

step up 加紧
例句：We must step up our vigilance.
我们一定要提高警惕。

3. With the escalation of the conflict since the end of March, the situation has worsened to a point that a number of humanitarian activists are calling the situation catastrophic.

a number of 许多的;一些
例句：Monkeys are transmitters of a number of dangerous diseases.
猴子是许多危险疾病的传染媒介。

4. Officials in Athens say that Greece has had to use a reserve account at the International Monetary Fund in order to make a bailout loan repayment to the IMF.

in order to　为了
例句：He did not come here in order to attend the meeting.
他来这里决不是要参加会议的。

5. He said it was wrong that the top 25 fund managers in the U.S. earn more than all the kindergarten teachers in the country put together.

more than 多于
例句：Common sense is worth more than learning.
普通的见识比学问更重要。