求翻译：Unlike traditional conservative income investing which might include such items as Certificates of Deposit [CDs], fixed annuities and government/corporate bonds, an aggressive portfolio will go after the higher yields while bearing the burden of the additional risk. One component of the additional risk will include corporate and municipal bonds which are rated below investment grade and have a higher risk of defaulting or failing to make timely interest payments. Add to these bonds a portfolio of diversified high yield income holdings, and one might be able to generate a good cash flow, plus participate in any price appreciation related to the underlying equities. In the end, it is the change in interest rates that will have the most impact upon the income portfolio as a whole. The major focus of this article, though, is not to highlight the below investment grade bonds, but to draw attention to other investment vehicles/sectors that one would need to create a successful aggressive income portfolio. In each section below will be examples of some great companies that may just fit the bill.是什么意思？

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