These observations, along with the likely existence of neutralinos, mean that dark matter looks like a known unknown.
这些观测，包括neutralinos存在的可能性，意味着暗物质看上去像是一个已知的未知，我们知道它的存在，但是却知之甚少。
The population mean is often written "x-bar." If you have a sample with n observations, it's the summation i = 1 to n of xi/n--that's the average.
人口均值经常写成“x-条形柱”，如果你有一个样本有n个观测者，是从 i=1到n和的xi/n，这是平均值。
The applicability of the similarity theory in the surface layer is studied by using the gradient observations of fluctuation and mean fields.
利用实测的脉动场与平均场同步梯度观测资料研究近地层相似理论的适用性。
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