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Four new relative efficiencies of the best linear unbiased estimator to the covariance improvement estimator for the unknown parameter vector are given, and three new relative efficiencies of the least square estimator to the covariance improvement estimator for the unknow parameter vector are given.

本文考虑相依模型，对其未知参数向量给出了其最佳线性无偏估计相对于协方差改进估计的四种相对效率，同时，还给出了最小二乘估计相对于协方差改进估计的三种相对效率，在不同条件下，分别给出了相对效率的上界与下界。

On the basis of diagnosis and measure of multicollinearity,a new biased estimator of unknown parameters called partial ridgeestimator is proposed for Gauss-Markov model.Its properties are discussed,and some important conclusions are drawn.The determination of biased parameter in the PR estimator is discussed too.

基于复共线性诊断和度量的结果，提出了测量平差Gauss-Markov模型参数的一个新的有偏估计，称为基于复共线性诊断和度量的部分岭估计，讨论了部分岭估计的优良性质，提出了岭参数的选取方法。

However, it remains unknown how the enhancement of bicarbonate levels results in cGMP production.

通过对体外表达 GC-D 的深入研究，首次发现碳酸氢根对它的激活完全不同于其同家族的其他膜蛋白的受调控方式。

Background— Bicuspid aortic valve is a heritable condition that has been linked by an unknown mechanism to a predisposition for ascending aortic aneurysm.

背景—二叶式主动脉瓣是一个易患升主动脉瘤的可遗传疾病，与升主动脉瘤连锁的机制还不清除。

Nevertheless, the traditional binomial produ ctivity equation can't work under the formation pressure unknown.

气井产能方程能够直接描述流压与产量的关系，但是传统的二项式产能方程在地层压力未知或者地层压力不准的情况下无法使用。

Research about the Binomial and Chebyshev Match;2. Nevertheless, the traditional binomial produ ctivity equation can't work under the formation pressure unknown.

气井产能方程能够直接描述流压与产量的关系，但是传统的二项式产能方程在地层压力未知或者地层压力不准的情况下无法使用。

How mitochondrial biogenesis is integrated with osteoclast differentiation is unknown.

但线粒体的生物发生是怎样和破骨细胞的分化整合到一起的还不清楚。

Detection of unknown compound from the collected biological sample has long been the difficult part of poison analysis.

从生物样品中检测未知物，一直以来是毒物分析中的一个难点。

Why that should be true only for this particular biotype is unknown. Finding the answer would make a lot of farmers happier.

但是，为什么只有这种特殊的生物型出现了该种情况还不得而知，因此，解答这一难题将使千千万万的农民受益。

A member of a people of unknown origin inhabiting the western Pyrenees and the Bay of Biscay in France and Spain.

巴斯克人居住在西班牙和法国毗临比斯开湾的比利牛斯西部地区一个民族中一员，起源不明

Plunder melds and run with this jewel!

掠夺melds和运行与此宝石！

My dream is to be a crazy growing tree and extend at the edge between the city and the forest.

此刻，也许正是在通往天国的路上，我体验着这白色的晕旋。