求翻译：Money-market funds react to changes in interest rates just like other fixed-income investments--an increase in interest rates causes their value to decrease. When interest rates rise from their historic lows, the likely result is the immediate decline in a money-market fund's NAV. The severity of that decline will be based on the size of the interest rate increase and the portfolio's maturity, as well as on shareholder activity.是什么意思？

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