Population parameters such as birth and death rates which vary with density are said to be density dependent.

如果种群参数如出生率和死亡率随种群密度的变化而变换，就可以说是密度制约的。

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The certain concentrations of fipronil approaching the LC50 can negatively affect population parameters of Daphnia pulex.

氟虫腈在水中的质量浓度达到LC50时对大型蚤的种群有影响。

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For a kind of population, the asymptotic best property of trimmed mean is discussed. Then, a expression of the best trimmed estimate of population parameters is given.

首先对一类总体讨论了截尾均值的渐近最优性，然后给出了更一般情形总体参数最优截尾估计的一个表达式。

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Then the volunteers will be given an antibiotic to essentially wipe out the population of M. smithii and the same parameters will be measured again, to see if eliminating the microbes will help change the patient's weight profile and alter their trajectory toward diabetes.

CNN: Can you smell obesity?