经济学人下载:一周要闻 美联储干预货币市场 美联储下调基准利率 沙特将恢复原油生产

Investment is a function of the interest rate.
投资随着利率的变化而变。 

2.filed for 申请

The actor's wife has filed for divorce again.
这位演员的妻子再一次申请离婚。

3.bankruptcy protection 破产保护

Less than two weeks later, they filed for bankruptcy protection.
不到两周之后，它们申请了破产保护。

4.public trust 公共信托

The regulatory agency of public undertakings shall give support to the activities of public trust.
公益事业管理机构对于公益信托活动应当给予支持。