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among which of which in which to which
among them was among whom was in which was among whom were
协方差体现的是两个随机变量随机变动时的相关程度 如果ρ=1，则ζ和η有完全的正线性相关关系 方差越大，协方差越大 cov（X，η）=E（X-EX）（η-Eη）
Apart from Except for Along with As good as
among which for which of which by which
among which among whose of whom of whose
along；to along；with along with；to with；with
among for against between
among them was among whom was in which was among whom were
among above beside Between
cov(X，Y)=cov(Y，X) cov(X，X)=D(X) cov(X，Y)=E[(X-E(X))(Y-E(Y))] cov(X，Y)=E(XY)-E(X)E(Y)
among them among whom between them between whom
lonely alone along almost
cov（X，Y）=cov（Y，X） cov（X，X）=D（X） cov（X，Y）=E[（X-E（X））（Y-E（Y））] cov（X，Y）=E（XY）-E（X）E（Y）
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