重点讲解：
1. a total of 总数；总额；合计；
例句：A total of twenty letters were received last month.
上个月共收到20封信。
2. amount to 合计；共计；
例句：His investments amount to five million dollars.
他的投资额达五百万元。
3. according to 据…所说；按…所载；
例句：According to industry statistics, the assets of money funds have grown sharply since the credit crisis began to intensify last summer.
据行业统计数据显示，自去年夏天信贷危机开始严重起货币基金的资产就开始急剧增长。
4. be based on 以…为基础；
例句：His theory is merely based on supposition.
他的理论只是根据推测而提出的。
5. deal with 处理；应付；与…打交道；
例句：Firstly, let us deal with the most important issue.
首先让我们来处理最紧要的问题。
