求翻译：A money-market fund's marked-to-market net asset value (NAV) changes every day and ranges from $0.9950 to $1.0050. This tight band of variation, when rounded either up or down to two decimals, equals $1.00, which is the price at which money-market funds, under normal market conditions, pay to redeem or issue shares. Money market funds face a variety of pressures on this NAV, including changes in interest rates.是什么意思？

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