The death and reproduction of the population make the mean density fluctuate but do not obviously change the overall level of population number and the population structure.

种群的死亡过程和繁殖过程使种群平均密度有较明显的波动，但对种群总体水平无明显影响，种群结构也无明显变化。

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When material quality and operating condition of manufactured object change or fluctuate, process parameters can't be automatically regulated.

当被加工对象的材质及工况条件有变化或波动时，不能对工艺参数自动地进行相应的调整。

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It will fluctuate and change over time.

它会波动，会随着时间而变化。

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Keep in mind that municipal securities are subject to a number of risks including, but not limited to: Interest Rate Risk, the risk that the market value of fixed-income securities may fluctuate when interest rates change, and Prepayment Risk, the risk that the issuers of individual securities may prepay them at a time when interest rates have declined.

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Mr. Barrickman said his fund has been doing well because of bigger exposure to interest rate risks, as measured by his portfolio's average 6.2-year duration a key measure of how bonds' prices fluctuate in relation to a given yield change.

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But she points out that the market goes up and down, like any other, tastes change and prices for even the most prized furniture makers fluctuate.

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