广播听力:Colossal Profits of China's Banks

词汇讲解：
1. maintain vt.保持; 继续；保养, 维护
例句：The two countries have maintained friendly relations for many years.
两国多年来一直保持着友好的关系。

2. profit n. 利润,盈利;收益,红利
例句：He made a profit of fifty thousand US dollars on his house.他卖掉房子获利五万美元。

3. margin n. 利润;赚头
例句：This price will allow a good margin of profit.
这一价格可获厚利。

4. domestic adj. 国家的;国内的
例句：The meeting concerns both foreign and domestic policies.
会议关系到国内外政策。