Its credit rating was investment grade.

其信用评级为投资等级。

It is now only a notch below investment grade.

再上升一个级别，印尼就能达到投资级别了。

S&P also cut Latvia to below investment grade.

标准普尔还把拉脱维亚信用评级调低至投资等级以下。

Who can rate these investment grade securities?

谁能评估这些投资级别的证券？

They market their instruments with fraudulent investment grade ratings.

他们用欺骗性的投资级别评级营销他们的金融工具。