求翻译：Private investment funds use a combination of equity, fixed-rate long-term debt, and floating-rate credit facilities to fund leveraged loan and equity investments. As of March 31, 2011, most of our rated private investment firms, and all of our rated BDCs, had leverage based on reported debt to equity of less than 0.5 to 1. Such low leverage makes them asset sensitive to interest rates so that as rates rise in an expanding economy, their earnings and debt-service metrics will improve.是什么意思？

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