图标式的一父，一母，几个孩子同住一个屋檐下的美国家庭越来越少。
The iconic American family, with mom, dad and kids under one roof, is fading.
我想起了那个高雅贵妇人式的年迈的母猩猩佛洛，还有她的女儿菲菲；1960年时菲菲还是只幼年猩猩，如今是那些猩猩中唯一存活下来的。
I thought of the grand old matriarch, Flo, and her daughter Fifi, a tiny infant in 1960 and the one individual from those days still alive now.
本文应用对母函数微分的方法得到正态随机矩阵多项式的均值与协差阵的表达式。
An expression for the mean and covariance matrix of normal random matrix polynomial is derived by applying the method of matrix differentiation to generating function.
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