在物理学中的对称性，事实上意味着某种基本量不可观测。
Actually the symmetry in physics means unmeasurable for certain fundamental quantities.
被动式目标跟踪主要存在两个问题：系统非线性和距离不可观测性。
There are two main problems in bearing-only tracking: system's nonlinearity and inscrutability of the range of target.
无仪器辅助情况下，肉眼不可观测到的活体生物，如细菌，霉菌，病毒或寄生物等。
Living things such as bacteria, molds, viruses and parasites that cannot be seen with the unassisted human eye.
针对二维空间作匀加速运动的目标，对纯方位系统跟踪的不可观测性问题进行了讨论。
The problem of unobservability for a bearings only target tracking system is discussed in this paper based on the target traveling in the 2 dimensional space at a uniform acceleration.
由于制备薄膜的反应器中气体流动具有复杂和不可观测的特点，国内对MOCVD反应器内部流场和温度场的研究只处在起步阶段。
Because of the complicated transport process and invisible characteristics, domestic researchers have carried out few explorations on internal flow and temperature distribution of the MOCVD reactor.
其所追求的并非事实或优雅，而是一种方法——通过它，可以抓住市场跳动的脉搏，并将一个不可观测或非流动的价格与交易市场的价格联系起来。
They are not seeking truth or elegance, just a way of capturing the behaviour of a market and of linking an unobservable or illiquid price to prices in traded markets.
该算法为了减小距离的不可观测性对于非线性滤波的影响，在假设的多段距离间隔中采用并行的高斯-厄密特滤波并加权获得目标的状态估计。
In order to decrease the influence of non-observability of distance, based on Gauss-Hermite filter, multihypothesis of distance is adopted to operate collateral filter.
该算法为了减小距离的不可观测性对于非线性滤波的影响，在假设的多段距离间隔中采用并行的高斯-厄密特滤波并加权获得目标的状态估计。
In order to decrease the influence of non-observability of distance, based on Gauss-Hermite filter, multihypothesis of distance is adopted to operate collateral filter.
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