枯死的榆树已被移去而换栽了一排幼树.The dead elms have been replaced by a row of saplings.这些幼树已经扎根了.The young trees have struck root.老苹果树必须挖掉,种上幼树.The old apple trees must be grubbed up and young ones planted....
The greatest lower bound of A is also called the infimum of A.A的最大下界边称为A的下确界.Property of symmetric random variable is discussed by introducing the concept of almost supremum and infimum.讨论了具有倒对称随机变量的若干性质.Gives the infimu...